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Finding the Fourth Proportional to 624.68, 861 and 493.40

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Solution

The fourth proportional to 624.68, 861 and 493.40 is: 680.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.68 : 861 = 493.40 : x
  2. Step 2: Convert to fraction form
    624.68/861 = 493.40/x
  3. Step 3: Cross multiply
    624.68x = 861 × 493.40
  4. Step 4: Simplify right side
    624.68x = 424,817.40
  5. Step 5: Solve for x
    x = 424,817.40/624.68
  6. Step 6: Final answer
    x = 680.06

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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.