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Finding the Fourth Proportional to 81,291.60, 121,937.40 and 34,538.40

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Solution

The fourth proportional to 81,291.60, 121,937.40 and 34,538.40 is: 51,807.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,291.60 : 121,937.40 = 34,538.40 : x
  2. Step 2: Convert to fraction form
    81,291.60/121,937.40 = 34,538.40/x
  3. Step 3: Cross multiply
    81,291.60x = 121,937.40 × 34,538.40
  4. Step 4: Simplify right side
    81,291.60x = 4,211,522,696.16
  5. Step 5: Solve for x
    x = 4,211,522,696.16/81,291.60
  6. Step 6: Final answer
    x = 51,807.60

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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.