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Finding the Fourth Proportional to 1,105.48, 1,525.14 and 690.76

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Solution

The fourth proportional to 1,105.48, 1,525.14 and 690.76 is: 952.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,105.48 : 1,525.14 = 690.76 : x
  2. Step 2: Convert to fraction form
    1,105.48/1,525.14 = 690.76/x
  3. Step 3: Cross multiply
    1,105.48x = 1,525.14 × 690.76
  4. Step 4: Simplify right side
    1,105.48x = 1,053,505.71
  5. Step 5: Solve for x
    x = 1,053,505.71/1,105.48
  6. Step 6: Final answer
    x = 952.98

Related Problems

Find fourth proportional to 552.74, 762.57 and 345.38
Half scale
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Double scale
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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.