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Finding the Fourth Proportional to 1,110.76, 1,532.86 and 668.76

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Solution

The fourth proportional to 1,110.76, 1,532.86 and 668.76 is: 922.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,110.76 : 1,532.86 = 668.76 : x
  2. Step 2: Convert to fraction form
    1,110.76/1,532.86 = 668.76/x
  3. Step 3: Cross multiply
    1,110.76x = 1,532.86 × 668.76
  4. Step 4: Simplify right side
    1,110.76x = 1,025,115.45
  5. Step 5: Solve for x
    x = 1,025,115.45/1,110.76
  6. Step 6: Final answer
    x = 922.90

Related Problems

Find fourth proportional to 555.38, 766.43 and 334.38
Half scale
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Double scale
Find fourth proportional to 1,111.76, 1,534.24 and 669.76
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.