Home / 1,288.29-1,776.66-1,089.53

Finding the Fourth Proportional to 1,288.29, 1,776.66 and 1,089.53

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Solution

The fourth proportional to 1,288.29, 1,776.66 and 1,089.53 is: 1,502.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.29 : 1,776.66 = 1,089.53 : x
  2. Step 2: Convert to fraction form
    1,288.29/1,776.66 = 1,089.53/x
  3. Step 3: Cross multiply
    1,288.29x = 1,776.66 × 1,089.53
  4. Step 4: Simplify right side
    1,288.29x = 1,935,729.29
  5. Step 5: Solve for x
    x = 1,935,729.29/1,288.29
  6. Step 6: Final answer
    x = 1,502.56

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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.