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Finding the Fourth Proportional to 292.18, 438.20 and 86.71

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Solution

The fourth proportional to 292.18, 438.20 and 86.71 is: 130.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    292.18 : 438.20 = 86.71 : x
  2. Step 2: Convert to fraction form
    292.18/438.20 = 86.71/x
  3. Step 3: Cross multiply
    292.18x = 438.20 × 86.71
  4. Step 4: Simplify right side
    292.18x = 37,994.64
  5. Step 5: Solve for x
    x = 37,994.64/292.18
  6. Step 6: Final answer
    x = 130.04

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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.