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Finding the Fourth Proportional to 870.67, 1,305.88 and 254.21

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Solution

The fourth proportional to 870.67, 1,305.88 and 254.21 is: 381.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.67 : 1,305.88 = 254.21 : x
  2. Step 2: Convert to fraction form
    870.67/1,305.88 = 254.21/x
  3. Step 3: Cross multiply
    870.67x = 1,305.88 × 254.21
  4. Step 4: Simplify right side
    870.67x = 331,971.34
  5. Step 5: Solve for x
    x = 331,971.34/870.67
  6. Step 6: Final answer
    x = 381.28

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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.