Home / 1,687.25-2,328.39-931.04

Finding the Fourth Proportional to 1,687.25, 2,328.39 and 931.04

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Solution

The fourth proportional to 1,687.25, 2,328.39 and 931.04 is: 1,284.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.25 : 2,328.39 = 931.04 : x
  2. Step 2: Convert to fraction form
    1,687.25/2,328.39 = 931.04/x
  3. Step 3: Cross multiply
    1,687.25x = 2,328.39 × 931.04
  4. Step 4: Simplify right side
    1,687.25x = 2,167,823.64
  5. Step 5: Solve for x
    x = 2,167,823.64/1,687.25
  6. Step 6: Final answer
    x = 1,284.82

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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.