Home / 1,245.40-1,718.78-1,207.12

Finding the Fourth Proportional to 1,245.40, 1,718.78 and 1,207.12

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Solution

The fourth proportional to 1,245.40, 1,718.78 and 1,207.12 is: 1,665.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.40 : 1,718.78 = 1,207.12 : x
  2. Step 2: Convert to fraction form
    1,245.40/1,718.78 = 1,207.12/x
  3. Step 3: Cross multiply
    1,245.40x = 1,718.78 × 1,207.12
  4. Step 4: Simplify right side
    1,245.40x = 2,074,773.71
  5. Step 5: Solve for x
    x = 2,074,773.71/1,245.40
  6. Step 6: Final answer
    x = 1,665.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.