Home / 1,689.36-2,330.58-981.15

Finding the Fourth Proportional to 1,689.36, 2,330.58 and 981.15

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Solution

The fourth proportional to 1,689.36, 2,330.58 and 981.15 is: 1,353.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689.36 : 2,330.58 = 981.15 : x
  2. Step 2: Convert to fraction form
    1,689.36/2,330.58 = 981.15/x
  3. Step 3: Cross multiply
    1,689.36x = 2,330.58 × 981.15
  4. Step 4: Simplify right side
    1,689.36x = 2,286,648.57
  5. Step 5: Solve for x
    x = 2,286,648.57/1,689.36
  6. Step 6: Final answer
    x = 1,353.56

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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.