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Finding the Fourth Proportional to 1,276.31, 1,913.84 and 749.35

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Solution

The fourth proportional to 1,276.31, 1,913.84 and 749.35 is: 1,123.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.31 : 1,913.84 = 749.35 : x
  2. Step 2: Convert to fraction form
    1,276.31/1,913.84 = 749.35/x
  3. Step 3: Cross multiply
    1,276.31x = 1,913.84 × 749.35
  4. Step 4: Simplify right side
    1,276.31x = 1,434,136.00
  5. Step 5: Solve for x
    x = 1,434,136.00/1,276.31
  6. Step 6: Final answer
    x = 1,123.66

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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.