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Finding the Fourth Proportional to 871.60, 1,202.80 and 498.80

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Solution

The fourth proportional to 871.60, 1,202.80 and 498.80 is: 688.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.60 : 1,202.80 = 498.80 : x
  2. Step 2: Convert to fraction form
    871.60/1,202.80 = 498.80/x
  3. Step 3: Cross multiply
    871.60x = 1,202.80 × 498.80
  4. Step 4: Simplify right side
    871.60x = 599,956.64
  5. Step 5: Solve for x
    x = 599,956.64/871.60
  6. Step 6: Final answer
    x = 688.34

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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.