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Finding the Fourth Proportional to 1,126.31, 1,689.15 and 433.00

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Solution

The fourth proportional to 1,126.31, 1,689.15 and 433.00 is: 649.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.31 : 1,689.15 = 433.00 : x
  2. Step 2: Convert to fraction form
    1,126.31/1,689.15 = 433.00/x
  3. Step 3: Cross multiply
    1,126.31x = 1,689.15 × 433.00
  4. Step 4: Simplify right side
    1,126.31x = 731,396.18
  5. Step 5: Solve for x
    x = 731,396.18/1,126.31
  6. Step 6: Final answer
    x = 649.38

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Half scale
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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.