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Finding the Fourth Proportional to 871.63, 1,305.91 and 459.86

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Solution

The fourth proportional to 871.63, 1,305.91 and 459.86 is: 688.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.63 : 1,305.91 = 459.86 : x
  2. Step 2: Convert to fraction form
    871.63/1,305.91 = 459.86/x
  3. Step 3: Cross multiply
    871.63x = 1,305.91 × 459.86
  4. Step 4: Simplify right side
    871.63x = 600,536.52
  5. Step 5: Solve for x
    x = 600,536.52/871.63
  6. Step 6: Final answer
    x = 688.98

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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.