Home / 1,261.27-1,889.55-913.76

Finding the Fourth Proportional to 1,261.27, 1,889.55 and 913.76

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Solution

The fourth proportional to 1,261.27, 1,889.55 and 913.76 is: 1,368.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.27 : 1,889.55 = 913.76 : x
  2. Step 2: Convert to fraction form
    1,261.27/1,889.55 = 913.76/x
  3. Step 3: Cross multiply
    1,261.27x = 1,889.55 × 913.76
  4. Step 4: Simplify right side
    1,261.27x = 1,726,590.10
  5. Step 5: Solve for x
    x = 1,726,590.10/1,261.27
  6. Step 6: Final answer
    x = 1,368.93

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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.