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Finding the Fourth Proportional to 81,248.40, 121,823.40 and 53,134.52

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Solution

The fourth proportional to 81,248.40, 121,823.40 and 53,134.52 is: 79,669.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,248.40 : 121,823.40 = 53,134.52 : x
  2. Step 2: Convert to fraction form
    81,248.40/121,823.40 = 53,134.52/x
  3. Step 3: Cross multiply
    81,248.40x = 121,823.40 × 53,134.52
  4. Step 4: Simplify right side
    81,248.40x = 6,473,027,883.77
  5. Step 5: Solve for x
    x = 6,473,027,883.77/81,248.40
  6. Step 6: Final answer
    x = 79,669.60

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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.