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Finding the Fourth Proportional to 611.25, 914.58 and 429

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Solution

The fourth proportional to 611.25, 914.58 and 429 is: 641.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.25 : 914.58 = 429 : x
  2. Step 2: Convert to fraction form
    611.25/914.58 = 429/x
  3. Step 3: Cross multiply
    611.25x = 914.58 × 429
  4. Step 4: Simplify right side
    611.25x = 392,354.82
  5. Step 5: Solve for x
    x = 392,354.82/611.25
  6. Step 6: Final answer
    x = 641.89

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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.