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Finding the Fourth Proportional to 78,906.44, 108,818.77 and 61,681.08

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Solution

The fourth proportional to 78,906.44, 108,818.77 and 61,681.08 is: 85,063.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,906.44 : 108,818.77 = 61,681.08 : x
  2. Step 2: Convert to fraction form
    78,906.44/108,818.77 = 61,681.08/x
  3. Step 3: Cross multiply
    78,906.44x = 108,818.77 × 61,681.08
  4. Step 4: Simplify right side
    78,906.44x = 6,712,058,841.81
  5. Step 5: Solve for x
    x = 6,712,058,841.81/78,906.44
  6. Step 6: Final answer
    x = 85,063.51

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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.