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Finding the Fourth Proportional to 759.43, 1,139.15 and 430.17

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Solution

The fourth proportional to 759.43, 1,139.15 and 430.17 is: 645.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.43 : 1,139.15 = 430.17 : x
  2. Step 2: Convert to fraction form
    759.43/1,139.15 = 430.17/x
  3. Step 3: Cross multiply
    759.43x = 1,139.15 × 430.17
  4. Step 4: Simplify right side
    759.43x = 490,028.16
  5. Step 5: Solve for x
    x = 490,028.16/759.43
  6. Step 6: Final answer
    x = 645.26

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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.