Home / 100,818.32-139,113-57,789.90

Finding the Fourth Proportional to 100,818.32, 139,113 and 57,789.90

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Solution

The fourth proportional to 100,818.32, 139,113 and 57,789.90 is: 79,740.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,818.32 : 139,113 = 57,789.90 : x
  2. Step 2: Convert to fraction form
    100,818.32/139,113 = 57,789.90/x
  3. Step 3: Cross multiply
    100,818.32x = 139,113 × 57,789.90
  4. Step 4: Simplify right side
    100,818.32x = 8,039,326,358.70
  5. Step 5: Solve for x
    x = 8,039,326,358.70/100,818.32
  6. Step 6: Final answer
    x = 79,740.73

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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.