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Finding the Fourth Proportional to 847.64, 1,271.40 and 481.28

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Solution

The fourth proportional to 847.64, 1,271.40 and 481.28 is: 721.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.64 : 1,271.40 = 481.28 : x
  2. Step 2: Convert to fraction form
    847.64/1,271.40 = 481.28/x
  3. Step 3: Cross multiply
    847.64x = 1,271.40 × 481.28
  4. Step 4: Simplify right side
    847.64x = 611,899.39
  5. Step 5: Solve for x
    x = 611,899.39/847.64
  6. Step 6: Final answer
    x = 721.89

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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.