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Finding the Fourth Proportional to 1,256.50, 1,885.56 and 487

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Solution

The fourth proportional to 1,256.50, 1,885.56 and 487 is: 730.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.50 : 1,885.56 = 487 : x
  2. Step 2: Convert to fraction form
    1,256.50/1,885.56 = 487/x
  3. Step 3: Cross multiply
    1,256.50x = 1,885.56 × 487
  4. Step 4: Simplify right side
    1,256.50x = 918,267.72
  5. Step 5: Solve for x
    x = 918,267.72/1,256.50
  6. Step 6: Final answer
    x = 730.81

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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.