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Finding the Fourth Proportional to 72,921.80, 109,382.70 and 69,811.40

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Solution

The fourth proportional to 72,921.80, 109,382.70 and 69,811.40 is: 104,717.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,921.80 : 109,382.70 = 69,811.40 : x
  2. Step 2: Convert to fraction form
    72,921.80/109,382.70 = 69,811.40/x
  3. Step 3: Cross multiply
    72,921.80x = 109,382.70 × 69,811.40
  4. Step 4: Simplify right side
    72,921.80x = 7,636,159,422.78
  5. Step 5: Solve for x
    x = 7,636,159,422.78/72,921.80
  6. Step 6: Final answer
    x = 104,717.10

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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.