Home / 78,519.85-108,359.18-42,711.78

Finding the Fourth Proportional to 78,519.85, 108,359.18 and 42,711.78

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Solution

The fourth proportional to 78,519.85, 108,359.18 and 42,711.78 is: 58,943.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,519.85 : 108,359.18 = 42,711.78 : x
  2. Step 2: Convert to fraction form
    78,519.85/108,359.18 = 42,711.78/x
  3. Step 3: Cross multiply
    78,519.85x = 108,359.18 × 42,711.78
  4. Step 4: Simplify right side
    78,519.85x = 4,628,212,701.79
  5. Step 5: Solve for x
    x = 4,628,212,701.79/78,519.85
  6. Step 6: Final answer
    x = 58,943.22

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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.