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Finding the Fourth Proportional to 91,812.70, 137,719.05 and 81,790.30

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Solution

The fourth proportional to 91,812.70, 137,719.05 and 81,790.30 is: 122,685.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,812.70 : 137,719.05 = 81,790.30 : x
  2. Step 2: Convert to fraction form
    91,812.70/137,719.05 = 81,790.30/x
  3. Step 3: Cross multiply
    91,812.70x = 137,719.05 × 81,790.30
  4. Step 4: Simplify right side
    91,812.70x = 11,264,082,415.22
  5. Step 5: Solve for x
    x = 11,264,082,415.22/91,812.70
  6. Step 6: Final answer
    x = 122,685.45

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1.5x scale

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.