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Finding the Fourth Proportional to 870.52, 1,305.78 and 407.96

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Solution

The fourth proportional to 870.52, 1,305.78 and 407.96 is: 611.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.52 : 1,305.78 = 407.96 : x
  2. Step 2: Convert to fraction form
    870.52/1,305.78 = 407.96/x
  3. Step 3: Cross multiply
    870.52x = 1,305.78 × 407.96
  4. Step 4: Simplify right side
    870.52x = 532,704.38
  5. Step 5: Solve for x
    x = 532,704.38/870.52
  6. Step 6: Final answer
    x = 611.94

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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.