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Finding the Fourth Proportional to 292.26, 438.40 and 86.83

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Solution

The fourth proportional to 292.26, 438.40 and 86.83 is: 130.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    292.26 : 438.40 = 86.83 : x
  2. Step 2: Convert to fraction form
    292.26/438.40 = 86.83/x
  3. Step 3: Cross multiply
    292.26x = 438.40 × 86.83
  4. Step 4: Simplify right side
    292.26x = 38,066.05
  5. Step 5: Solve for x
    x = 38,066.05/292.26
  6. Step 6: Final answer
    x = 130.25

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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.