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Finding the Fourth Proportional to 1,126.80, 1,553.95 and 707.19

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Solution

The fourth proportional to 1,126.80, 1,553.95 and 707.19 is: 975.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.80 : 1,553.95 = 707.19 : x
  2. Step 2: Convert to fraction form
    1,126.80/1,553.95 = 707.19/x
  3. Step 3: Cross multiply
    1,126.80x = 1,553.95 × 707.19
  4. Step 4: Simplify right side
    1,126.80x = 1,098,937.90
  5. Step 5: Solve for x
    x = 1,098,937.90/1,126.80
  6. Step 6: Final answer
    x = 975.27

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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.