Home / 1,419.66-2,126.28-689.76

Finding the Fourth Proportional to 1,419.66, 2,126.28 and 689.76

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Solution

The fourth proportional to 1,419.66, 2,126.28 and 689.76 is: 1,033.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.66 : 2,126.28 = 689.76 : x
  2. Step 2: Convert to fraction form
    1,419.66/2,126.28 = 689.76/x
  3. Step 3: Cross multiply
    1,419.66x = 2,126.28 × 689.76
  4. Step 4: Simplify right side
    1,419.66x = 1,466,622.89
  5. Step 5: Solve for x
    x = 1,466,622.89/1,419.66
  6. Step 6: Final answer
    x = 1,033.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.