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Finding the Fourth Proportional to 697.92, 1,042.62 and 521.40

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Solution

The fourth proportional to 697.92, 1,042.62 and 521.40 is: 778.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.92 : 1,042.62 = 521.40 : x
  2. Step 2: Convert to fraction form
    697.92/1,042.62 = 521.40/x
  3. Step 3: Cross multiply
    697.92x = 1,042.62 × 521.40
  4. Step 4: Simplify right side
    697.92x = 543,622.07
  5. Step 5: Solve for x
    x = 543,622.07/697.92
  6. Step 6: Final answer
    x = 778.92

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.