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Finding the Fourth Proportional to 1,236.50, 1,854.99 and 687.50

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Solution

The fourth proportional to 1,236.50, 1,854.99 and 687.50 is: 1,031.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.50 : 1,854.99 = 687.50 : x
  2. Step 2: Convert to fraction form
    1,236.50/1,854.99 = 687.50/x
  3. Step 3: Cross multiply
    1,236.50x = 1,854.99 × 687.50
  4. Step 4: Simplify right side
    1,236.50x = 1,275,305.63
  5. Step 5: Solve for x
    x = 1,275,305.63/1,236.50
  6. Step 6: Final answer
    x = 1,031.38

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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.