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Finding the Fourth Proportional to 761.54, 1,139.43 and 715.46

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Solution

The fourth proportional to 761.54, 1,139.43 and 715.46 is: 1,070.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.54 : 1,139.43 = 715.46 : x
  2. Step 2: Convert to fraction form
    761.54/1,139.43 = 715.46/x
  3. Step 3: Cross multiply
    761.54x = 1,139.43 × 715.46
  4. Step 4: Simplify right side
    761.54x = 815,216.59
  5. Step 5: Solve for x
    x = 815,216.59/761.54
  6. Step 6: Final answer
    x = 1,070.48

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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.