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Finding the Fourth Proportional to 678.15, 935.08 and 553.43

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Solution

The fourth proportional to 678.15, 935.08 and 553.43 is: 763.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.15 : 935.08 = 553.43 : x
  2. Step 2: Convert to fraction form
    678.15/935.08 = 553.43/x
  3. Step 3: Cross multiply
    678.15x = 935.08 × 553.43
  4. Step 4: Simplify right side
    678.15x = 517,502.28
  5. Step 5: Solve for x
    x = 517,502.28/678.15
  6. Step 6: Final answer
    x = 763.11

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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.