Home / 1,657.28-2,279.40-1,391.60

Finding the Fourth Proportional to 1,657.28, 2,279.40 and 1,391.60

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Solution

The fourth proportional to 1,657.28, 2,279.40 and 1,391.60 is: 1,913.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,657.28 : 2,279.40 = 1,391.60 : x
  2. Step 2: Convert to fraction form
    1,657.28/2,279.40 = 1,391.60/x
  3. Step 3: Cross multiply
    1,657.28x = 2,279.40 × 1,391.60
  4. Step 4: Simplify right side
    1,657.28x = 3,172,013.04
  5. Step 5: Solve for x
    x = 3,172,013.04/1,657.28
  6. Step 6: Final answer
    x = 1,913.99

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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.