Home / 8,521.20-12,781.80-2,678.40

Finding the Fourth Proportional to 8,521.20, 12,781.80 and 2,678.40

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Solution

The fourth proportional to 8,521.20, 12,781.80 and 2,678.40 is: 4,017.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,521.20 : 12,781.80 = 2,678.40 : x
  2. Step 2: Convert to fraction form
    8,521.20/12,781.80 = 2,678.40/x
  3. Step 3: Cross multiply
    8,521.20x = 12,781.80 × 2,678.40
  4. Step 4: Simplify right side
    8,521.20x = 34,234,773.12
  5. Step 5: Solve for x
    x = 34,234,773.12/8,521.20
  6. Step 6: Final answer
    x = 4,017.60

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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.