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Finding the Fourth Proportional to 871.08, 1,300.50 and 664.56

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Solution

The fourth proportional to 871.08, 1,300.50 and 664.56 is: 992.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.08 : 1,300.50 = 664.56 : x
  2. Step 2: Convert to fraction form
    871.08/1,300.50 = 664.56/x
  3. Step 3: Cross multiply
    871.08x = 1,300.50 × 664.56
  4. Step 4: Simplify right side
    871.08x = 864,260.28
  5. Step 5: Solve for x
    x = 864,260.28/871.08
  6. Step 6: Final answer
    x = 992.17

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.