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Finding the Fourth Proportional to 1,309.47, 1,964.62 and 487.86

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Solution

The fourth proportional to 1,309.47, 1,964.62 and 487.86 is: 731.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.47 : 1,964.62 = 487.86 : x
  2. Step 2: Convert to fraction form
    1,309.47/1,964.62 = 487.86/x
  3. Step 3: Cross multiply
    1,309.47x = 1,964.62 × 487.86
  4. Step 4: Simplify right side
    1,309.47x = 958,452.76
  5. Step 5: Solve for x
    x = 958,452.76/1,309.47
  6. Step 6: Final answer
    x = 731.94

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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.