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Finding the Fourth Proportional to 624.60, 861.65 and 403.47

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Solution

The fourth proportional to 624.60, 861.65 and 403.47 is: 556.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.60 : 861.65 = 403.47 : x
  2. Step 2: Convert to fraction form
    624.60/861.65 = 403.47/x
  3. Step 3: Cross multiply
    624.60x = 861.65 × 403.47
  4. Step 4: Simplify right side
    624.60x = 347,649.93
  5. Step 5: Solve for x
    x = 347,649.93/624.60
  6. Step 6: Final answer
    x = 556.60

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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.