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Finding the Fourth Proportional to 72,242.40, 99,689.88 and 40,405.80

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Solution

The fourth proportional to 72,242.40, 99,689.88 and 40,405.80 is: 55,757.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,242.40 : 99,689.88 = 40,405.80 : x
  2. Step 2: Convert to fraction form
    72,242.40/99,689.88 = 40,405.80/x
  3. Step 3: Cross multiply
    72,242.40x = 99,689.88 × 40,405.80
  4. Step 4: Simplify right side
    72,242.40x = 4,028,049,353.30
  5. Step 5: Solve for x
    x = 4,028,049,353.30/72,242.40
  6. Step 6: Final answer
    x = 55,757.41

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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.