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Finding the Fourth Proportional to 72,991.20, 109,486.80 and 57,244.80

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Solution

The fourth proportional to 72,991.20, 109,486.80 and 57,244.80 is: 85,867.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,991.20 : 109,486.80 = 57,244.80 : x
  2. Step 2: Convert to fraction form
    72,991.20/109,486.80 = 57,244.80/x
  3. Step 3: Cross multiply
    72,991.20x = 109,486.80 × 57,244.80
  4. Step 4: Simplify right side
    72,991.20x = 6,267,549,968.64
  5. Step 5: Solve for x
    x = 6,267,549,968.64/72,991.20
  6. Step 6: Final answer
    x = 85,867.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.