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Finding the Fourth Proportional to 80,547.40, 120,821.10 and 21,392.20

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Solution

The fourth proportional to 80,547.40, 120,821.10 and 21,392.20 is: 32,088.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,547.40 : 120,821.10 = 21,392.20 : x
  2. Step 2: Convert to fraction form
    80,547.40/120,821.10 = 21,392.20/x
  3. Step 3: Cross multiply
    80,547.40x = 120,821.10 × 21,392.20
  4. Step 4: Simplify right side
    80,547.40x = 2,584,629,135.42
  5. Step 5: Solve for x
    x = 2,584,629,135.42/80,547.40
  6. Step 6: Final answer
    x = 32,088.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.