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Finding the Fourth Proportional to 91,572.99, 137,570.65 and 87,789.63

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Solution

The fourth proportional to 91,572.99, 137,570.65 and 87,789.63 is: 131,886.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,572.99 : 137,570.65 = 87,789.63 : x
  2. Step 2: Convert to fraction form
    91,572.99/137,570.65 = 87,789.63/x
  3. Step 3: Cross multiply
    91,572.99x = 137,570.65 × 87,789.63
  4. Step 4: Simplify right side
    91,572.99x = 12,077,276,118.43
  5. Step 5: Solve for x
    x = 12,077,276,118.43/91,572.99
  6. Step 6: Final answer
    x = 131,886.89

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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.