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Finding the Fourth Proportional to 91,412.80, 137,119.20 and 72,980.80

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Solution

The fourth proportional to 91,412.80, 137,119.20 and 72,980.80 is: 109,471.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,412.80 : 137,119.20 = 72,980.80 : x
  2. Step 2: Convert to fraction form
    91,412.80/137,119.20 = 72,980.80/x
  3. Step 3: Cross multiply
    91,412.80x = 137,119.20 × 72,980.80
  4. Step 4: Simplify right side
    91,412.80x = 10,007,068,911.36
  5. Step 5: Solve for x
    x = 10,007,068,911.36/91,412.80
  6. Step 6: Final answer
    x = 109,471.20

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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.