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Finding the Fourth Proportional to 72,405.55, 99,914.20 and 40,568.30

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Solution

The fourth proportional to 72,405.55, 99,914.20 and 40,568.30 is: 55,981.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,405.55 : 99,914.20 = 40,568.30 : x
  2. Step 2: Convert to fraction form
    72,405.55/99,914.20 = 40,568.30/x
  3. Step 3: Cross multiply
    72,405.55x = 99,914.20 × 40,568.30
  4. Step 4: Simplify right side
    72,405.55x = 4,053,349,239.86
  5. Step 5: Solve for x
    x = 4,053,349,239.86/72,405.55
  6. Step 6: Final answer
    x = 55,981.20

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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.