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Finding the Fourth Proportional to 1,281.85, 1,769.08 and 751

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Solution

The fourth proportional to 1,281.85, 1,769.08 and 751 is: 1,036.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.85 : 1,769.08 = 751 : x
  2. Step 2: Convert to fraction form
    1,281.85/1,769.08 = 751/x
  3. Step 3: Cross multiply
    1,281.85x = 1,769.08 × 751
  4. Step 4: Simplify right side
    1,281.85x = 1,328,579.08
  5. Step 5: Solve for x
    x = 1,328,579.08/1,281.85
  6. Step 6: Final answer
    x = 1,036.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.