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Finding the Fourth Proportional to 90,779.76, 135,803.28 and 81,326.52

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Solution

The fourth proportional to 90,779.76, 135,803.28 and 81,326.52 is: 121,661.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,779.76 : 135,803.28 = 81,326.52 : x
  2. Step 2: Convert to fraction form
    90,779.76/135,803.28 = 81,326.52/x
  3. Step 3: Cross multiply
    90,779.76x = 135,803.28 × 81,326.52
  4. Step 4: Simplify right side
    90,779.76x = 11,044,408,166.99
  5. Step 5: Solve for x
    x = 11,044,408,166.99/90,779.76
  6. Step 6: Final answer
    x = 121,661.57

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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.