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Finding the Fourth Proportional to 71,807.79, 107,711.60 and 19,215.91

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Solution

The fourth proportional to 71,807.79, 107,711.60 and 19,215.91 is: 28,823.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,807.79 : 107,711.60 = 19,215.91 : x
  2. Step 2: Convert to fraction form
    71,807.79/107,711.60 = 19,215.91/x
  3. Step 3: Cross multiply
    71,807.79x = 107,711.60 × 19,215.91
  4. Step 4: Simplify right side
    71,807.79x = 2,069,775,873.00
  5. Step 5: Solve for x
    x = 2,069,775,873.00/71,807.79
  6. Step 6: Final answer
    x = 28,823.83

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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.