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Finding the Fourth Proportional to 749.13, 1,124.70 and 485.96

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Solution

The fourth proportional to 749.13, 1,124.70 and 485.96 is: 729.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.13 : 1,124.70 = 485.96 : x
  2. Step 2: Convert to fraction form
    749.13/1,124.70 = 485.96/x
  3. Step 3: Cross multiply
    749.13x = 1,124.70 × 485.96
  4. Step 4: Simplify right side
    749.13x = 546,553.59
  5. Step 5: Solve for x
    x = 546,553.59/749.13
  6. Step 6: Final answer
    x = 729.58

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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.