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Finding the Fourth Proportional to 78,701.03, 108,604.25 and 42,890.26

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Solution

The fourth proportional to 78,701.03, 108,604.25 and 42,890.26 is: 59,186.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,701.03 : 108,604.25 = 42,890.26 : x
  2. Step 2: Convert to fraction form
    78,701.03/108,604.25 = 42,890.26/x
  3. Step 3: Cross multiply
    78,701.03x = 108,604.25 × 42,890.26
  4. Step 4: Simplify right side
    78,701.03x = 4,658,064,519.61
  5. Step 5: Solve for x
    x = 4,658,064,519.61/78,701.03
  6. Step 6: Final answer
    x = 59,186.83

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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.