Home / 78,720.41-108,633.29-42,909.64

Finding the Fourth Proportional to 78,720.41, 108,633.29 and 42,909.64

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Solution

The fourth proportional to 78,720.41, 108,633.29 and 42,909.64 is: 59,214.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,720.41 : 108,633.29 = 42,909.64 : x
  2. Step 2: Convert to fraction form
    78,720.41/108,633.29 = 42,909.64/x
  3. Step 3: Cross multiply
    78,720.41x = 108,633.29 × 42,909.64
  4. Step 4: Simplify right side
    78,720.41x = 4,661,414,879.78
  5. Step 5: Solve for x
    x = 4,661,414,879.78/78,720.41
  6. Step 6: Final answer
    x = 59,214.82

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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.