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Finding the Fourth Proportional to 624.09, 861.48 and 388.08

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Solution

The fourth proportional to 624.09, 861.48 and 388.08 is: 535.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.09 : 861.48 = 388.08 : x
  2. Step 2: Convert to fraction form
    624.09/861.48 = 388.08/x
  3. Step 3: Cross multiply
    624.09x = 861.48 × 388.08
  4. Step 4: Simplify right side
    624.09x = 334,323.16
  5. Step 5: Solve for x
    x = 334,323.16/624.09
  6. Step 6: Final answer
    x = 535.70

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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.