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Finding the Fourth Proportional to 868.34, 1,302.80 and 291.21

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Solution

The fourth proportional to 868.34, 1,302.80 and 291.21 is: 436.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.34 : 1,302.80 = 291.21 : x
  2. Step 2: Convert to fraction form
    868.34/1,302.80 = 291.21/x
  3. Step 3: Cross multiply
    868.34x = 1,302.80 × 291.21
  4. Step 4: Simplify right side
    868.34x = 379,386.93
  5. Step 5: Solve for x
    x = 379,386.93/868.34
  6. Step 6: Final answer
    x = 436.91

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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.