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Finding the Fourth Proportional to 870.66, 1,305.69 and 254.35

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Solution

The fourth proportional to 870.66, 1,305.69 and 254.35 is: 381.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.66 : 1,305.69 = 254.35 : x
  2. Step 2: Convert to fraction form
    870.66/1,305.69 = 254.35/x
  3. Step 3: Cross multiply
    870.66x = 1,305.69 × 254.35
  4. Step 4: Simplify right side
    870.66x = 332,102.93
  5. Step 5: Solve for x
    x = 332,102.93/870.66
  6. Step 6: Final answer
    x = 381.44

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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.