Home / 78,718.25-108,630.68-42,909.77

Finding the Fourth Proportional to 78,718.25, 108,630.68 and 42,909.77

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Solution

The fourth proportional to 78,718.25, 108,630.68 and 42,909.77 is: 59,215.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,718.25 : 108,630.68 = 42,909.77 : x
  2. Step 2: Convert to fraction form
    78,718.25/108,630.68 = 42,909.77/x
  3. Step 3: Cross multiply
    78,718.25x = 108,630.68 × 42,909.77
  4. Step 4: Simplify right side
    78,718.25x = 4,661,317,550.77
  5. Step 5: Solve for x
    x = 4,661,317,550.77/78,718.25
  6. Step 6: Final answer
    x = 59,215.21

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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.