Home / 1,689.12-2,330.24-1,191.78

Finding the Fourth Proportional to 1,689.12, 2,330.24 and 1,191.78

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Solution

The fourth proportional to 1,689.12, 2,330.24 and 1,191.78 is: 1,644.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689.12 : 2,330.24 = 1,191.78 : x
  2. Step 2: Convert to fraction form
    1,689.12/2,330.24 = 1,191.78/x
  3. Step 3: Cross multiply
    1,689.12x = 2,330.24 × 1,191.78
  4. Step 4: Simplify right side
    1,689.12x = 2,777,127.47
  5. Step 5: Solve for x
    x = 2,777,127.47/1,689.12
  6. Step 6: Final answer
    x = 1,644.13

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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.