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Finding the Fourth Proportional to 100,370.75, 138,565.43 and 77,518.83

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Solution

The fourth proportional to 100,370.75, 138,565.43 and 77,518.83 is: 107,017.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,370.75 : 138,565.43 = 77,518.83 : x
  2. Step 2: Convert to fraction form
    100,370.75/138,565.43 = 77,518.83/x
  3. Step 3: Cross multiply
    100,370.75x = 138,565.43 × 77,518.83
  4. Step 4: Simplify right side
    100,370.75x = 10,741,429,624.45
  5. Step 5: Solve for x
    x = 10,741,429,624.45/100,370.75
  6. Step 6: Final answer
    x = 107,017.53

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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.