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Finding the Fourth Proportional to 761.87, 1,140.47 and 488.22

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Solution

The fourth proportional to 761.87, 1,140.47 and 488.22 is: 730.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.87 : 1,140.47 = 488.22 : x
  2. Step 2: Convert to fraction form
    761.87/1,140.47 = 488.22/x
  3. Step 3: Cross multiply
    761.87x = 1,140.47 × 488.22
  4. Step 4: Simplify right side
    761.87x = 556,800.26
  5. Step 5: Solve for x
    x = 556,800.26/761.87
  6. Step 6: Final answer
    x = 730.83

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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.