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Finding the Fourth Proportional to 292.87, 439.05 and 138.72

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Solution

The fourth proportional to 292.87, 439.05 and 138.72 is: 207.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    292.87 : 439.05 = 138.72 : x
  2. Step 2: Convert to fraction form
    292.87/439.05 = 138.72/x
  3. Step 3: Cross multiply
    292.87x = 439.05 × 138.72
  4. Step 4: Simplify right side
    292.87x = 60,904.71
  5. Step 5: Solve for x
    x = 60,904.71/292.87
  6. Step 6: Final answer
    x = 207.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.