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Finding the Fourth Proportional to 761.38, 1,139.43 and 468.75

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Solution

The fourth proportional to 761.38, 1,139.43 and 468.75 is: 701.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.38 : 1,139.43 = 468.75 : x
  2. Step 2: Convert to fraction form
    761.38/1,139.43 = 468.75/x
  3. Step 3: Cross multiply
    761.38x = 1,139.43 × 468.75
  4. Step 4: Simplify right side
    761.38x = 534,107.81
  5. Step 5: Solve for x
    x = 534,107.81/761.38
  6. Step 6: Final answer
    x = 701.50

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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.