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Finding the Fourth Proportional to 72,240.52, 99,696.80 and 40,412.40

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Solution

The fourth proportional to 72,240.52, 99,696.80 and 40,412.40 is: 55,771.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,240.52 : 99,696.80 = 40,412.40 : x
  2. Step 2: Convert to fraction form
    72,240.52/99,696.80 = 40,412.40/x
  3. Step 3: Cross multiply
    72,240.52x = 99,696.80 × 40,412.40
  4. Step 4: Simplify right side
    72,240.52x = 4,028,986,960.32
  5. Step 5: Solve for x
    x = 4,028,986,960.32/72,240.52
  6. Step 6: Final answer
    x = 55,771.84

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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.