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Finding the Fourth Proportional to 624.12, 860.85 and 387.81

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Solution

The fourth proportional to 624.12, 860.85 and 387.81 is: 534.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.12 : 860.85 = 387.81 : x
  2. Step 2: Convert to fraction form
    624.12/860.85 = 387.81/x
  3. Step 3: Cross multiply
    624.12x = 860.85 × 387.81
  4. Step 4: Simplify right side
    624.12x = 333,846.24
  5. Step 5: Solve for x
    x = 333,846.24/624.12
  6. Step 6: Final answer
    x = 534.91

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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.