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Finding the Fourth Proportional to 1,256.69, 1,885.11 and 423.68

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Solution

The fourth proportional to 1,256.69, 1,885.11 and 423.68 is: 635.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.69 : 1,885.11 = 423.68 : x
  2. Step 2: Convert to fraction form
    1,256.69/1,885.11 = 423.68/x
  3. Step 3: Cross multiply
    1,256.69x = 1,885.11 × 423.68
  4. Step 4: Simplify right side
    1,256.69x = 798,688.12
  5. Step 5: Solve for x
    x = 798,688.12/1,256.69
  6. Step 6: Final answer
    x = 635.55

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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.