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Finding the Fourth Proportional to 1,256.78, 1,885.03 and 391.02

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Solution

The fourth proportional to 1,256.78, 1,885.03 and 391.02 is: 586.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.78 : 1,885.03 = 391.02 : x
  2. Step 2: Convert to fraction form
    1,256.78/1,885.03 = 391.02/x
  3. Step 3: Cross multiply
    1,256.78x = 1,885.03 × 391.02
  4. Step 4: Simplify right side
    1,256.78x = 737,084.43
  5. Step 5: Solve for x
    x = 737,084.43/1,256.78
  6. Step 6: Final answer
    x = 586.49

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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.