Home / 78,701.40-108,609.12-42,891.30

Finding the Fourth Proportional to 78,701.40, 108,609.12 and 42,891.30

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Solution

The fourth proportional to 78,701.40, 108,609.12 and 42,891.30 is: 59,190.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,701.40 : 108,609.12 = 42,891.30 : x
  2. Step 2: Convert to fraction form
    78,701.40/108,609.12 = 42,891.30/x
  3. Step 3: Cross multiply
    78,701.40x = 108,609.12 × 42,891.30
  4. Step 4: Simplify right side
    78,701.40x = 4,658,386,348.66
  5. Step 5: Solve for x
    x = 4,658,386,348.66/78,701.40
  6. Step 6: Final answer
    x = 59,190.64

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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.