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Finding the Fourth Proportional to 749.48, 1,123.53 and 687.98

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Solution

The fourth proportional to 749.48, 1,123.53 and 687.98 is: 1,031.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.48 : 1,123.53 = 687.98 : x
  2. Step 2: Convert to fraction form
    749.48/1,123.53 = 687.98/x
  3. Step 3: Cross multiply
    749.48x = 1,123.53 × 687.98
  4. Step 4: Simplify right side
    749.48x = 772,966.17
  5. Step 5: Solve for x
    x = 772,966.17/749.48
  6. Step 6: Final answer
    x = 1,031.34

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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.