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Finding the Fourth Proportional to 91,424.60, 137,136.90 and 87,925.40

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Solution

The fourth proportional to 91,424.60, 137,136.90 and 87,925.40 is: 131,888.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,424.60 : 137,136.90 = 87,925.40 : x
  2. Step 2: Convert to fraction form
    91,424.60/137,136.90 = 87,925.40/x
  3. Step 3: Cross multiply
    91,424.60x = 137,136.90 × 87,925.40
  4. Step 4: Simplify right side
    91,424.60x = 12,057,816,787.26
  5. Step 5: Solve for x
    x = 12,057,816,787.26/91,424.60
  6. Step 6: Final answer
    x = 131,888.10

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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.