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Finding the Fourth Proportional to 678.52, 1,018.32 and 557.56

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Solution

The fourth proportional to 678.52, 1,018.32 and 557.56 is: 836.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.52 : 1,018.32 = 557.56 : x
  2. Step 2: Convert to fraction form
    678.52/1,018.32 = 557.56/x
  3. Step 3: Cross multiply
    678.52x = 1,018.32 × 557.56
  4. Step 4: Simplify right side
    678.52x = 567,774.50
  5. Step 5: Solve for x
    x = 567,774.50/678.52
  6. Step 6: Final answer
    x = 836.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.