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Finding the Fourth Proportional to 39,872.40, 59,808.60 and 18,812.40

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Solution

The fourth proportional to 39,872.40, 59,808.60 and 18,812.40 is: 28,218.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,872.40 : 59,808.60 = 18,812.40 : x
  2. Step 2: Convert to fraction form
    39,872.40/59,808.60 = 18,812.40/x
  3. Step 3: Cross multiply
    39,872.40x = 59,808.60 × 18,812.40
  4. Step 4: Simplify right side
    39,872.40x = 1,125,143,306.64
  5. Step 5: Solve for x
    x = 1,125,143,306.64/39,872.40
  6. Step 6: Final answer
    x = 28,218.60

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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.