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Finding the Fourth Proportional to 971.50, 1,340.85 and 557.50

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Solution

The fourth proportional to 971.50, 1,340.85 and 557.50 is: 769.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.50 : 1,340.85 = 557.50 : x
  2. Step 2: Convert to fraction form
    971.50/1,340.85 = 557.50/x
  3. Step 3: Cross multiply
    971.50x = 1,340.85 × 557.50
  4. Step 4: Simplify right side
    971.50x = 747,523.88
  5. Step 5: Solve for x
    x = 747,523.88/971.50
  6. Step 6: Final answer
    x = 769.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.