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Finding the Fourth Proportional to 72,456.64, 99,987.80 and 40,191.12

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Solution

The fourth proportional to 72,456.64, 99,987.80 and 40,191.12 is: 55,462.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,456.64 : 99,987.80 = 40,191.12 : x
  2. Step 2: Convert to fraction form
    72,456.64/99,987.80 = 40,191.12/x
  3. Step 3: Cross multiply
    72,456.64x = 99,987.80 × 40,191.12
  4. Step 4: Simplify right side
    72,456.64x = 4,018,621,668.34
  5. Step 5: Solve for x
    x = 4,018,621,668.34/72,456.64
  6. Step 6: Final answer
    x = 55,462.43

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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.