Home / 1,689.22-2,330.40-981.01

Finding the Fourth Proportional to 1,689.22, 2,330.40 and 981.01

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Solution

The fourth proportional to 1,689.22, 2,330.40 and 981.01 is: 1,353.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689.22 : 2,330.40 = 981.01 : x
  2. Step 2: Convert to fraction form
    1,689.22/2,330.40 = 981.01/x
  3. Step 3: Cross multiply
    1,689.22x = 2,330.40 × 981.01
  4. Step 4: Simplify right side
    1,689.22x = 2,286,145.70
  5. Step 5: Solve for x
    x = 2,286,145.70/1,689.22
  6. Step 6: Final answer
    x = 1,353.37

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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.