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Finding the Fourth Proportional to 1,130.91, 1,557.18 and 990.24

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Solution

The fourth proportional to 1,130.91, 1,557.18 and 990.24 is: 1,363.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.91 : 1,557.18 = 990.24 : x
  2. Step 2: Convert to fraction form
    1,130.91/1,557.18 = 990.24/x
  3. Step 3: Cross multiply
    1,130.91x = 1,557.18 × 990.24
  4. Step 4: Simplify right side
    1,130.91x = 1,541,981.92
  5. Step 5: Solve for x
    x = 1,541,981.92/1,130.91
  6. Step 6: Final answer
    x = 1,363.49

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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.