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Finding the Fourth Proportional to 71,748.45, 99,013.77 and 39,486.78

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Solution

The fourth proportional to 71,748.45, 99,013.77 and 39,486.78 is: 54,492.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,748.45 : 99,013.77 = 39,486.78 : x
  2. Step 2: Convert to fraction form
    71,748.45/99,013.77 = 39,486.78/x
  3. Step 3: Cross multiply
    71,748.45x = 99,013.77 × 39,486.78
  4. Step 4: Simplify right side
    71,748.45x = 3,909,734,952.96
  5. Step 5: Solve for x
    x = 3,909,734,952.96/71,748.45
  6. Step 6: Final answer
    x = 54,492.26

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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.