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Finding the Fourth Proportional to 72,402.40, 108,599.65 and 19,808.09

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Solution

The fourth proportional to 72,402.40, 108,599.65 and 19,808.09 is: 29,711.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,402.40 : 108,599.65 = 19,808.09 : x
  2. Step 2: Convert to fraction form
    72,402.40/108,599.65 = 19,808.09/x
  3. Step 3: Cross multiply
    72,402.40x = 108,599.65 × 19,808.09
  4. Step 4: Simplify right side
    72,402.40x = 2,151,151,048.65
  5. Step 5: Solve for x
    x = 2,151,151,048.65/72,402.40
  6. Step 6: Final answer
    x = 29,711.05

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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.