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Finding the Fourth Proportional to 85,478.30, 117,892.80 and 79,748.78

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Solution

The fourth proportional to 85,478.30, 117,892.80 and 79,748.78 is: 109,990.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,478.30 : 117,892.80 = 79,748.78 : x
  2. Step 2: Convert to fraction form
    85,478.30/117,892.80 = 79,748.78/x
  3. Step 3: Cross multiply
    85,478.30x = 117,892.80 × 79,748.78
  4. Step 4: Simplify right side
    85,478.30x = 9,401,806,970.78
  5. Step 5: Solve for x
    x = 9,401,806,970.78/85,478.30
  6. Step 6: Final answer
    x = 109,990.57

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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.