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Finding the Fourth Proportional to 72,375.90, 99,906.39 and 70,378.38

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Solution

The fourth proportional to 72,375.90, 99,906.39 and 70,378.38 is: 97,149.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,375.90 : 99,906.39 = 70,378.38 : x
  2. Step 2: Convert to fraction form
    72,375.90/99,906.39 = 70,378.38/x
  3. Step 3: Cross multiply
    72,375.90x = 99,906.39 × 70,378.38
  4. Step 4: Simplify right side
    72,375.90x = 7,031,249,879.85
  5. Step 5: Solve for x
    x = 7,031,249,879.85/72,375.90
  6. Step 6: Final answer
    x = 97,149.05

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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.