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Finding the Fourth Proportional to 12,613.88, 18,920.83 and 5,210.20

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Solution

The fourth proportional to 12,613.88, 18,920.83 and 5,210.20 is: 7,815.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,613.88 : 18,920.83 = 5,210.20 : x
  2. Step 2: Convert to fraction form
    12,613.88/18,920.83 = 5,210.20/x
  3. Step 3: Cross multiply
    12,613.88x = 18,920.83 × 5,210.20
  4. Step 4: Simplify right side
    12,613.88x = 98,581,282.42
  5. Step 5: Solve for x
    x = 98,581,282.42/12,613.88
  6. Step 6: Final answer
    x = 7,815.30

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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.