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Finding the Fourth Proportional to 292.14, 438.21 and 86.71

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Solution

The fourth proportional to 292.14, 438.21 and 86.71 is: 130.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    292.14 : 438.21 = 86.71 : x
  2. Step 2: Convert to fraction form
    292.14/438.21 = 86.71/x
  3. Step 3: Cross multiply
    292.14x = 438.21 × 86.71
  4. Step 4: Simplify right side
    292.14x = 37,997.19
  5. Step 5: Solve for x
    x = 37,997.19/292.14
  6. Step 6: Final answer
    x = 130.07

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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.