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Finding the Fourth Proportional to 70,990, 97,972.80 and 40,779.52

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Solution

The fourth proportional to 70,990, 97,972.80 and 40,779.52 is: 56,279.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,990 : 97,972.80 = 40,779.52 : x
  2. Step 2: Convert to fraction form
    70,990/97,972.80 = 40,779.52/x
  3. Step 3: Cross multiply
    70,990x = 97,972.80 × 40,779.52
  4. Step 4: Simplify right side
    70,990x = 3,995,283,757.06
  5. Step 5: Solve for x
    x = 3,995,283,757.06/70,990
  6. Step 6: Final answer
    x = 56,279.53

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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.