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Finding the Fourth Proportional to 678.45, 935.17 and 553.89

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Solution

The fourth proportional to 678.45, 935.17 and 553.89 is: 763.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.45 : 935.17 = 553.89 : x
  2. Step 2: Convert to fraction form
    678.45/935.17 = 553.89/x
  3. Step 3: Cross multiply
    678.45x = 935.17 × 553.89
  4. Step 4: Simplify right side
    678.45x = 517,981.31
  5. Step 5: Solve for x
    x = 517,981.31/678.45
  6. Step 6: Final answer
    x = 763.48

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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.