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Finding the Fourth Proportional to 72,486.90, 100,035.20 and 40,657.85

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Solution

The fourth proportional to 72,486.90, 100,035.20 and 40,657.85 is: 56,109.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,486.90 : 100,035.20 = 40,657.85 : x
  2. Step 2: Convert to fraction form
    72,486.90/100,035.20 = 40,657.85/x
  3. Step 3: Cross multiply
    72,486.90x = 100,035.20 × 40,657.85
  4. Step 4: Simplify right side
    72,486.90x = 4,067,216,132.92
  5. Step 5: Solve for x
    x = 4,067,216,132.92/72,486.90
  6. Step 6: Final answer
    x = 56,109.67

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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.