Home / 1,687.22-2,328.36-931.08

Finding the Fourth Proportional to 1,687.22, 2,328.36 and 931.08

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Solution

The fourth proportional to 1,687.22, 2,328.36 and 931.08 is: 1,284.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.22 : 2,328.36 = 931.08 : x
  2. Step 2: Convert to fraction form
    1,687.22/2,328.36 = 931.08/x
  3. Step 3: Cross multiply
    1,687.22x = 2,328.36 × 931.08
  4. Step 4: Simplify right side
    1,687.22x = 2,167,889.43
  5. Step 5: Solve for x
    x = 2,167,889.43/1,687.22
  6. Step 6: Final answer
    x = 1,284.89

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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.