Home / 1,217.08-1,686.19-1,191.16

Finding the Fourth Proportional to 1,217.08, 1,686.19 and 1,191.16

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Solution

The fourth proportional to 1,217.08, 1,686.19 and 1,191.16 is: 1,650.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.08 : 1,686.19 = 1,191.16 : x
  2. Step 2: Convert to fraction form
    1,217.08/1,686.19 = 1,191.16/x
  3. Step 3: Cross multiply
    1,217.08x = 1,686.19 × 1,191.16
  4. Step 4: Simplify right side
    1,217.08x = 2,008,522.08
  5. Step 5: Solve for x
    x = 2,008,522.08/1,217.08
  6. Step 6: Final answer
    x = 1,650.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.