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Finding the Fourth Proportional to 72,170.69, 99,595.91 and 40,338.90

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Solution

The fourth proportional to 72,170.69, 99,595.91 and 40,338.90 is: 55,667.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,170.69 : 99,595.91 = 40,338.90 : x
  2. Step 2: Convert to fraction form
    72,170.69/99,595.91 = 40,338.90/x
  3. Step 3: Cross multiply
    72,170.69x = 99,595.91 × 40,338.90
  4. Step 4: Simplify right side
    72,170.69x = 4,017,589,554.75
  5. Step 5: Solve for x
    x = 4,017,589,554.75/72,170.69
  6. Step 6: Final answer
    x = 55,667.89

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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.