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Finding the Fourth Proportional to 623.94, 861.15 and 387.99

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Solution

The fourth proportional to 623.94, 861.15 and 387.99 is: 535.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.94 : 861.15 = 387.99 : x
  2. Step 2: Convert to fraction form
    623.94/861.15 = 387.99/x
  3. Step 3: Cross multiply
    623.94x = 861.15 × 387.99
  4. Step 4: Simplify right side
    623.94x = 334,116.86
  5. Step 5: Solve for x
    x = 334,116.86/623.94
  6. Step 6: Final answer
    x = 535.50

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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.