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Finding the Fourth Proportional to 72,421.59, 99,919.79 and 45,590.88

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Solution

The fourth proportional to 72,421.59, 99,919.79 and 45,590.88 is: 62,901.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,421.59 : 99,919.79 = 45,590.88 : x
  2. Step 2: Convert to fraction form
    72,421.59/99,919.79 = 45,590.88/x
  3. Step 3: Cross multiply
    72,421.59x = 99,919.79 × 45,590.88
  4. Step 4: Simplify right side
    72,421.59x = 4,555,431,729.67
  5. Step 5: Solve for x
    x = 4,555,431,729.67/72,421.59
  6. Step 6: Final answer
    x = 62,901.57

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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.