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Finding the Fourth Proportional to 78,676.90, 108,575.36 and 42,866.90

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Solution

The fourth proportional to 78,676.90, 108,575.36 and 42,866.90 is: 59,156.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,676.90 : 108,575.36 = 42,866.90 : x
  2. Step 2: Convert to fraction form
    78,676.90/108,575.36 = 42,866.90/x
  3. Step 3: Cross multiply
    78,676.90x = 108,575.36 × 42,866.90
  4. Step 4: Simplify right side
    78,676.90x = 4,654,288,663.87
  5. Step 5: Solve for x
    x = 4,654,288,663.87/78,676.90
  6. Step 6: Final answer
    x = 59,156.99

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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.