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Finding the Fourth Proportional to 1,130.43, 1,560.15 and 816.74

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Solution

The fourth proportional to 1,130.43, 1,560.15 and 816.74 is: 1,127.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.43 : 1,560.15 = 816.74 : x
  2. Step 2: Convert to fraction form
    1,130.43/1,560.15 = 816.74/x
  3. Step 3: Cross multiply
    1,130.43x = 1,560.15 × 816.74
  4. Step 4: Simplify right side
    1,130.43x = 1,274,229.11
  5. Step 5: Solve for x
    x = 1,274,229.11/1,130.43
  6. Step 6: Final answer
    x = 1,127.21

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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.