Home / 1,243.52-1,865.28-421.79

Finding the Fourth Proportional to 1,243.52, 1,865.28 and 421.79

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Solution

The fourth proportional to 1,243.52, 1,865.28 and 421.79 is: 632.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.52 : 1,865.28 = 421.79 : x
  2. Step 2: Convert to fraction form
    1,243.52/1,865.28 = 421.79/x
  3. Step 3: Cross multiply
    1,243.52x = 1,865.28 × 421.79
  4. Step 4: Simplify right side
    1,243.52x = 786,756.45
  5. Step 5: Solve for x
    x = 786,756.45/1,243.52
  6. Step 6: Final answer
    x = 632.69

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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.