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Finding the Fourth Proportional to 761.43, 1,138.50 and 647.22

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Solution

The fourth proportional to 761.43, 1,138.50 and 647.22 is: 967.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.43 : 1,138.50 = 647.22 : x
  2. Step 2: Convert to fraction form
    761.43/1,138.50 = 647.22/x
  3. Step 3: Cross multiply
    761.43x = 1,138.50 × 647.22
  4. Step 4: Simplify right side
    761.43x = 736,859.97
  5. Step 5: Solve for x
    x = 736,859.97/761.43
  6. Step 6: Final answer
    x = 967.73

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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.