Home / 1,289.46-1,934.28-423.78

Finding the Fourth Proportional to 1,289.46, 1,934.28 and 423.78

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Solution

The fourth proportional to 1,289.46, 1,934.28 and 423.78 is: 635.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.46 : 1,934.28 = 423.78 : x
  2. Step 2: Convert to fraction form
    1,289.46/1,934.28 = 423.78/x
  3. Step 3: Cross multiply
    1,289.46x = 1,934.28 × 423.78
  4. Step 4: Simplify right side
    1,289.46x = 819,709.18
  5. Step 5: Solve for x
    x = 819,709.18/1,289.46
  6. Step 6: Final answer
    x = 635.70

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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.