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Finding the Fourth Proportional to 72,213.60, 99,648 and 40,381.44

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Solution

The fourth proportional to 72,213.60, 99,648 and 40,381.44 is: 55,722.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,213.60 : 99,648 = 40,381.44 : x
  2. Step 2: Convert to fraction form
    72,213.60/99,648 = 40,381.44/x
  3. Step 3: Cross multiply
    72,213.60x = 99,648 × 40,381.44
  4. Step 4: Simplify right side
    72,213.60x = 4,023,929,733.12
  5. Step 5: Solve for x
    x = 4,023,929,733.12/72,213.60
  6. Step 6: Final answer
    x = 55,722.60

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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.