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Finding the Fourth Proportional to 761.65, 1,140.89 and 631.34

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Solution

The fourth proportional to 761.65, 1,140.89 and 631.34 is: 945.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.65 : 1,140.89 = 631.34 : x
  2. Step 2: Convert to fraction form
    761.65/1,140.89 = 631.34/x
  3. Step 3: Cross multiply
    761.65x = 1,140.89 × 631.34
  4. Step 4: Simplify right side
    761.65x = 720,291.33
  5. Step 5: Solve for x
    x = 720,291.33/761.65
  6. Step 6: Final answer
    x = 945.69

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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.