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Finding the Fourth Proportional to 678.85, 936.46 and 429.74

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Solution

The fourth proportional to 678.85, 936.46 and 429.74 is: 592.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.85 : 936.46 = 429.74 : x
  2. Step 2: Convert to fraction form
    678.85/936.46 = 429.74/x
  3. Step 3: Cross multiply
    678.85x = 936.46 × 429.74
  4. Step 4: Simplify right side
    678.85x = 402,434.32
  5. Step 5: Solve for x
    x = 402,434.32/678.85
  6. Step 6: Final answer
    x = 592.82

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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.