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Finding the Fourth Proportional to 78,677.90, 108,576.74 and 42,867.90

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Solution

The fourth proportional to 78,677.90, 108,576.74 and 42,867.90 is: 59,158.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,677.90 : 108,576.74 = 42,867.90 : x
  2. Step 2: Convert to fraction form
    78,677.90/108,576.74 = 42,867.90/x
  3. Step 3: Cross multiply
    78,677.90x = 108,576.74 × 42,867.90
  4. Step 4: Simplify right side
    78,677.90x = 4,654,456,832.65
  5. Step 5: Solve for x
    x = 4,654,456,832.65/78,677.90
  6. Step 6: Final answer
    x = 59,158.38

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1.5x scale

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.