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Finding the Fourth Proportional to 1,687.98, 2,328.09 and 1,098.71

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Solution

The fourth proportional to 1,687.98, 2,328.09 and 1,098.71 is: 1,515.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.98 : 2,328.09 = 1,098.71 : x
  2. Step 2: Convert to fraction form
    1,687.98/2,328.09 = 1,098.71/x
  3. Step 3: Cross multiply
    1,687.98x = 2,328.09 × 1,098.71
  4. Step 4: Simplify right side
    1,687.98x = 2,557,884.12
  5. Step 5: Solve for x
    x = 2,557,884.12/1,687.98
  6. Step 6: Final answer
    x = 1,515.35

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1.5x scale

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.