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Finding the Fourth Proportional to 292.36, 438.60 and 86.92

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Solution

The fourth proportional to 292.36, 438.60 and 86.92 is: 130.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    292.36 : 438.60 = 86.92 : x
  2. Step 2: Convert to fraction form
    292.36/438.60 = 86.92/x
  3. Step 3: Cross multiply
    292.36x = 438.60 × 86.92
  4. Step 4: Simplify right side
    292.36x = 38,123.11
  5. Step 5: Solve for x
    x = 38,123.11/292.36
  6. Step 6: Final answer
    x = 130.40

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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.