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Finding the Fourth Proportional to 753.69, 1,038.58 and 717.85

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Solution

The fourth proportional to 753.69, 1,038.58 and 717.85 is: 989.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.69 : 1,038.58 = 717.85 : x
  2. Step 2: Convert to fraction form
    753.69/1,038.58 = 717.85/x
  3. Step 3: Cross multiply
    753.69x = 1,038.58 × 717.85
  4. Step 4: Simplify right side
    753.69x = 745,544.65
  5. Step 5: Solve for x
    x = 745,544.65/753.69
  6. Step 6: Final answer
    x = 989.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.