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Finding the Fourth Proportional to 813.54, 1,122.20 and 498.86

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Solution

The fourth proportional to 813.54, 1,122.20 and 498.86 is: 688.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.54 : 1,122.20 = 498.86 : x
  2. Step 2: Convert to fraction form
    813.54/1,122.20 = 498.86/x
  3. Step 3: Cross multiply
    813.54x = 1,122.20 × 498.86
  4. Step 4: Simplify right side
    813.54x = 559,812.59
  5. Step 5: Solve for x
    x = 559,812.59/813.54
  6. Step 6: Final answer
    x = 688.12

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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.