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Finding the Fourth Proportional to 624.06, 860.76 and 387.81

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Solution

The fourth proportional to 624.06, 860.76 and 387.81 is: 534.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.06 : 860.76 = 387.81 : x
  2. Step 2: Convert to fraction form
    624.06/860.76 = 387.81/x
  3. Step 3: Cross multiply
    624.06x = 860.76 × 387.81
  4. Step 4: Simplify right side
    624.06x = 333,811.34
  5. Step 5: Solve for x
    x = 333,811.34/624.06
  6. Step 6: Final answer
    x = 534.90

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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.