Home / 78,720.10-108,632.11-42,909.80

Finding the Fourth Proportional to 78,720.10, 108,632.11 and 42,909.80

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Solution

The fourth proportional to 78,720.10, 108,632.11 and 42,909.80 is: 59,214.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,720.10 : 108,632.11 = 42,909.80 : x
  2. Step 2: Convert to fraction form
    78,720.10/108,632.11 = 42,909.80/x
  3. Step 3: Cross multiply
    78,720.10x = 108,632.11 × 42,909.80
  4. Step 4: Simplify right side
    78,720.10x = 4,661,382,113.68
  5. Step 5: Solve for x
    x = 4,661,382,113.68/78,720.10
  6. Step 6: Final answer
    x = 59,214.64

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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.