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Finding the Fourth Proportional to 869.11, 1,302.75 and 637.65

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Solution

The fourth proportional to 869.11, 1,302.75 and 637.65 is: 955.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.11 : 1,302.75 = 637.65 : x
  2. Step 2: Convert to fraction form
    869.11/1,302.75 = 637.65/x
  3. Step 3: Cross multiply
    869.11x = 1,302.75 × 637.65
  4. Step 4: Simplify right side
    869.11x = 830,698.54
  5. Step 5: Solve for x
    x = 830,698.54/869.11
  6. Step 6: Final answer
    x = 955.81

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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.