Home / 1,689.49-2,330.26-1,121.68

Finding the Fourth Proportional to 1,689.49, 2,330.26 and 1,121.68

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Solution

The fourth proportional to 1,689.49, 2,330.26 and 1,121.68 is: 1,547.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689.49 : 2,330.26 = 1,121.68 : x
  2. Step 2: Convert to fraction form
    1,689.49/2,330.26 = 1,121.68/x
  3. Step 3: Cross multiply
    1,689.49x = 2,330.26 × 1,121.68
  4. Step 4: Simplify right side
    1,689.49x = 2,613,806.04
  5. Step 5: Solve for x
    x = 2,613,806.04/1,689.49
  6. Step 6: Final answer
    x = 1,547.10

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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.