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Finding the Fourth Proportional to 1,127.60, 1,552.49 and 987.57

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Solution

The fourth proportional to 1,127.60, 1,552.49 and 987.57 is: 1,359.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.60 : 1,552.49 = 987.57 : x
  2. Step 2: Convert to fraction form
    1,127.60/1,552.49 = 987.57/x
  3. Step 3: Cross multiply
    1,127.60x = 1,552.49 × 987.57
  4. Step 4: Simplify right side
    1,127.60x = 1,533,192.55
  5. Step 5: Solve for x
    x = 1,533,192.55/1,127.60
  6. Step 6: Final answer
    x = 1,359.70

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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.