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Finding the Fourth Proportional to 745.65, 1,117.10 and 663.63

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Solution

The fourth proportional to 745.65, 1,117.10 and 663.63 is: 994.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.65 : 1,117.10 = 663.63 : x
  2. Step 2: Convert to fraction form
    745.65/1,117.10 = 663.63/x
  3. Step 3: Cross multiply
    745.65x = 1,117.10 × 663.63
  4. Step 4: Simplify right side
    745.65x = 741,337.75
  5. Step 5: Solve for x
    x = 741,337.75/745.65
  6. Step 6: Final answer
    x = 994.22

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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.