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Finding the Fourth Proportional to 79,031.84, 108,935.91 and 61,774.11

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Solution

The fourth proportional to 79,031.84, 108,935.91 and 61,774.11 is: 85,148.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,031.84 : 108,935.91 = 61,774.11 : x
  2. Step 2: Convert to fraction form
    79,031.84/108,935.91 = 61,774.11/x
  3. Step 3: Cross multiply
    79,031.84x = 108,935.91 × 61,774.11
  4. Step 4: Simplify right side
    79,031.84x = 6,729,418,887.29
  5. Step 5: Solve for x
    x = 6,729,418,887.29/79,031.84
  6. Step 6: Final answer
    x = 85,148.20

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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.