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Finding the Fourth Proportional to 751.65, 1,036.76 and 689.69

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Solution

The fourth proportional to 751.65, 1,036.76 and 689.69 is: 951.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.65 : 1,036.76 = 689.69 : x
  2. Step 2: Convert to fraction form
    751.65/1,036.76 = 689.69/x
  3. Step 3: Cross multiply
    751.65x = 1,036.76 × 689.69
  4. Step 4: Simplify right side
    751.65x = 715,040.85
  5. Step 5: Solve for x
    x = 715,040.85/751.65
  6. Step 6: Final answer
    x = 951.29

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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.