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Finding the Fourth Proportional to 71,799.72, 99,078.84 and 39,967.80

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Solution

The fourth proportional to 71,799.72, 99,078.84 and 39,967.80 is: 55,152.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,799.72 : 99,078.84 = 39,967.80 : x
  2. Step 2: Convert to fraction form
    71,799.72/99,078.84 = 39,967.80/x
  3. Step 3: Cross multiply
    71,799.72x = 99,078.84 × 39,967.80
  4. Step 4: Simplify right side
    71,799.72x = 3,959,963,261.35
  5. Step 5: Solve for x
    x = 3,959,963,261.35/71,799.72
  6. Step 6: Final answer
    x = 55,152.91

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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.