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Finding the Fourth Proportional to 91,551.60, 137,424.47 and 81,089.51

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Solution

The fourth proportional to 91,551.60, 137,424.47 and 81,089.51 is: 121,720.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,551.60 : 137,424.47 = 81,089.51 : x
  2. Step 2: Convert to fraction form
    91,551.60/137,424.47 = 81,089.51/x
  3. Step 3: Cross multiply
    91,551.60x = 137,424.47 × 81,089.51
  4. Step 4: Simplify right side
    91,551.60x = 11,143,681,841.74
  5. Step 5: Solve for x
    x = 11,143,681,841.74/91,551.60
  6. Step 6: Final answer
    x = 121,720.23

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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.