Home / 78,720.15-108,630.54-42,909.39

Finding the Fourth Proportional to 78,720.15, 108,630.54 and 42,909.39

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Solution

The fourth proportional to 78,720.15, 108,630.54 and 42,909.39 is: 59,213.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,720.15 : 108,630.54 = 42,909.39 : x
  2. Step 2: Convert to fraction form
    78,720.15/108,630.54 = 42,909.39/x
  3. Step 3: Cross multiply
    78,720.15x = 108,630.54 × 42,909.39
  4. Step 4: Simplify right side
    78,720.15x = 4,661,270,206.77
  5. Step 5: Solve for x
    x = 4,661,270,206.77/78,720.15
  6. Step 6: Final answer
    x = 59,213.18

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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.