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Finding the Fourth Proportional to 502.75, 754.02 and 421.35

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Solution

The fourth proportional to 502.75, 754.02 and 421.35 is: 631.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    502.75 : 754.02 = 421.35 : x
  2. Step 2: Convert to fraction form
    502.75/754.02 = 421.35/x
  3. Step 3: Cross multiply
    502.75x = 754.02 × 421.35
  4. Step 4: Simplify right side
    502.75x = 317,703.50
  5. Step 5: Solve for x
    x = 317,703.50/502.75
  6. Step 6: Final answer
    x = 631.93

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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.