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Finding the Fourth Proportional to 697.50, 962.58 and 402.78

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Solution

The fourth proportional to 697.50, 962.58 and 402.78 is: 555.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.50 : 962.58 = 402.78 : x
  2. Step 2: Convert to fraction form
    697.50/962.58 = 402.78/x
  3. Step 3: Cross multiply
    697.50x = 962.58 × 402.78
  4. Step 4: Simplify right side
    697.50x = 387,707.97
  5. Step 5: Solve for x
    x = 387,707.97/697.50
  6. Step 6: Final answer
    x = 555.85

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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.