Home / 78,677.36-108,615.89-61,412.70

Finding the Fourth Proportional to 78,677.36, 108,615.89 and 61,412.70

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Solution

The fourth proportional to 78,677.36, 108,615.89 and 61,412.70 is: 84,781.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,677.36 : 108,615.89 = 61,412.70 : x
  2. Step 2: Convert to fraction form
    78,677.36/108,615.89 = 61,412.70/x
  3. Step 3: Cross multiply
    78,677.36x = 108,615.89 × 61,412.70
  4. Step 4: Simplify right side
    78,677.36x = 6,670,395,067.80
  5. Step 5: Solve for x
    x = 6,670,395,067.80/78,677.36
  6. Step 6: Final answer
    x = 84,781.63

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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.