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Finding the Fourth Proportional to 120,821.20, 169,499.60 and 120,821.20

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Solution

The fourth proportional to 120,821.20, 169,499.60 and 120,821.20 is: 169,499.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,821.20 : 169,499.60 = 120,821.20 : x
  2. Step 2: Convert to fraction form
    120,821.20/169,499.60 = 120,821.20/x
  3. Step 3: Cross multiply
    120,821.20x = 169,499.60 × 120,821.20
  4. Step 4: Simplify right side
    120,821.20x = 20,479,145,071.52
  5. Step 5: Solve for x
    x = 20,479,145,071.52/120,821.20
  6. Step 6: Final answer
    x = 169,499.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.