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Finding the Fourth Proportional to 870.28, 1,304.86 and 407.44

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Solution

The fourth proportional to 870.28, 1,304.86 and 407.44 is: 610.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.28 : 1,304.86 = 407.44 : x
  2. Step 2: Convert to fraction form
    870.28/1,304.86 = 407.44/x
  3. Step 3: Cross multiply
    870.28x = 1,304.86 × 407.44
  4. Step 4: Simplify right side
    870.28x = 531,652.16
  5. Step 5: Solve for x
    x = 531,652.16/870.28
  6. Step 6: Final answer
    x = 610.90

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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.