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Finding the Fourth Proportional to 869.25, 1,302.80 and 381.81

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Solution

The fourth proportional to 869.25, 1,302.80 and 381.81 is: 572.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.25 : 1,302.80 = 381.81 : x
  2. Step 2: Convert to fraction form
    869.25/1,302.80 = 381.81/x
  3. Step 3: Cross multiply
    869.25x = 1,302.80 × 381.81
  4. Step 4: Simplify right side
    869.25x = 497,420.16
  5. Step 5: Solve for x
    x = 497,420.16/869.25
  6. Step 6: Final answer
    x = 572.24

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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.