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Finding the Fourth Proportional to 813.02, 1,121.46 and 498.20

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Solution

The fourth proportional to 813.02, 1,121.46 and 498.20 is: 687.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.02 : 1,121.46 = 498.20 : x
  2. Step 2: Convert to fraction form
    813.02/1,121.46 = 498.20/x
  3. Step 3: Cross multiply
    813.02x = 1,121.46 × 498.20
  4. Step 4: Simplify right side
    813.02x = 558,711.37
  5. Step 5: Solve for x
    x = 558,711.37/813.02
  6. Step 6: Final answer
    x = 687.20

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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.