Home / 91,916.81-137,991.87-78,153.29

Finding the Fourth Proportional to 91,916.81, 137,991.87 and 78,153.29

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Solution

The fourth proportional to 91,916.81, 137,991.87 and 78,153.29 is: 117,329.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,916.81 : 137,991.87 = 78,153.29 : x
  2. Step 2: Convert to fraction form
    91,916.81/137,991.87 = 78,153.29/x
  3. Step 3: Cross multiply
    91,916.81x = 137,991.87 × 78,153.29
  4. Step 4: Simplify right side
    91,916.81x = 10,784,517,943.79
  5. Step 5: Solve for x
    x = 10,784,517,943.79/91,916.81
  6. Step 6: Final answer
    x = 117,329.12

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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.