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Finding the Fourth Proportional to 848.66, 1,171.20 and 638.46

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Solution

The fourth proportional to 848.66, 1,171.20 and 638.46 is: 881.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    848.66 : 1,171.20 = 638.46 : x
  2. Step 2: Convert to fraction form
    848.66/1,171.20 = 638.46/x
  3. Step 3: Cross multiply
    848.66x = 1,171.20 × 638.46
  4. Step 4: Simplify right side
    848.66x = 747,761.83
  5. Step 5: Solve for x
    x = 747,761.83/848.66
  6. Step 6: Final answer
    x = 881.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.