Home / 1,391.46-1,909.98-1,230.57

Finding the Fourth Proportional to 1,391.46, 1,909.98 and 1,230.57

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Solution

The fourth proportional to 1,391.46, 1,909.98 and 1,230.57 is: 1,689.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.46 : 1,909.98 = 1,230.57 : x
  2. Step 2: Convert to fraction form
    1,391.46/1,909.98 = 1,230.57/x
  3. Step 3: Cross multiply
    1,391.46x = 1,909.98 × 1,230.57
  4. Step 4: Simplify right side
    1,391.46x = 2,350,364.09
  5. Step 5: Solve for x
    x = 2,350,364.09/1,391.46
  6. Step 6: Final answer
    x = 1,689.14

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.