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Finding the Fourth Proportional to 81,353.60, 121,900.80 and 60,358.40

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Solution

The fourth proportional to 81,353.60, 121,900.80 and 60,358.40 is: 90,441.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,353.60 : 121,900.80 = 60,358.40 : x
  2. Step 2: Convert to fraction form
    81,353.60/121,900.80 = 60,358.40/x
  3. Step 3: Cross multiply
    81,353.60x = 121,900.80 × 60,358.40
  4. Step 4: Simplify right side
    81,353.60x = 7,357,737,246.72
  5. Step 5: Solve for x
    x = 7,357,737,246.72/81,353.60
  6. Step 6: Final answer
    x = 90,441.45

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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.