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Finding the Fourth Proportional to 71,681.28, 98,636.64 and 64,974.48

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Solution

The fourth proportional to 71,681.28, 98,636.64 and 64,974.48 is: 89,407.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,681.28 : 98,636.64 = 64,974.48 : x
  2. Step 2: Convert to fraction form
    71,681.28/98,636.64 = 64,974.48/x
  3. Step 3: Cross multiply
    71,681.28x = 98,636.64 × 64,974.48
  4. Step 4: Simplify right side
    71,681.28x = 6,408,864,392.95
  5. Step 5: Solve for x
    x = 6,408,864,392.95/71,681.28
  6. Step 6: Final answer
    x = 89,407.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.