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Finding the Fourth Proportional to 1,130.76, 1,561.88 and 1,020.20

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Solution

The fourth proportional to 1,130.76, 1,561.88 and 1,020.20 is: 1,409.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.76 : 1,561.88 = 1,020.20 : x
  2. Step 2: Convert to fraction form
    1,130.76/1,561.88 = 1,020.20/x
  3. Step 3: Cross multiply
    1,130.76x = 1,561.88 × 1,020.20
  4. Step 4: Simplify right side
    1,130.76x = 1,593,424.72
  5. Step 5: Solve for x
    x = 1,593,424.72/1,130.76
  6. Step 6: Final answer
    x = 1,409.16

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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.