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Finding the Fourth Proportional to 292.04, 438.12 and 86.61

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Solution

The fourth proportional to 292.04, 438.12 and 86.61 is: 129.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    292.04 : 438.12 = 86.61 : x
  2. Step 2: Convert to fraction form
    292.04/438.12 = 86.61/x
  3. Step 3: Cross multiply
    292.04x = 438.12 × 86.61
  4. Step 4: Simplify right side
    292.04x = 37,945.57
  5. Step 5: Solve for x
    x = 37,945.57/292.04
  6. Step 6: Final answer
    x = 129.94

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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.