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Finding the Fourth Proportional to 2,689.70, 4,028.88 and 1,230.08

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Solution

The fourth proportional to 2,689.70, 4,028.88 and 1,230.08 is: 1,842.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,689.70 : 4,028.88 = 1,230.08 : x
  2. Step 2: Convert to fraction form
    2,689.70/4,028.88 = 1,230.08/x
  3. Step 3: Cross multiply
    2,689.70x = 4,028.88 × 1,230.08
  4. Step 4: Simplify right side
    2,689.70x = 4,955,844.71
  5. Step 5: Solve for x
    x = 4,955,844.71/2,689.70
  6. Step 6: Final answer
    x = 1,842.53

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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.