Home / 1,278.12-1,765.40-1,153.72

Finding the Fourth Proportional to 1,278.12, 1,765.40 and 1,153.72

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Solution

The fourth proportional to 1,278.12, 1,765.40 and 1,153.72 is: 1,593.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.12 : 1,765.40 = 1,153.72 : x
  2. Step 2: Convert to fraction form
    1,278.12/1,765.40 = 1,153.72/x
  3. Step 3: Cross multiply
    1,278.12x = 1,765.40 × 1,153.72
  4. Step 4: Simplify right side
    1,278.12x = 2,036,777.29
  5. Step 5: Solve for x
    x = 2,036,777.29/1,278.12
  6. Step 6: Final answer
    x = 1,593.57

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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.