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Finding the Fourth Proportional to 874.65, 1,309.47 and 743.88

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Solution

The fourth proportional to 874.65, 1,309.47 and 743.88 is: 1,113.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.65 : 1,309.47 = 743.88 : x
  2. Step 2: Convert to fraction form
    874.65/1,309.47 = 743.88/x
  3. Step 3: Cross multiply
    874.65x = 1,309.47 × 743.88
  4. Step 4: Simplify right side
    874.65x = 974,090.66
  5. Step 5: Solve for x
    x = 974,090.66/874.65
  6. Step 6: Final answer
    x = 1,113.69

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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.