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Finding the Fourth Proportional to 813.38, 1,220.48 and 374.63

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Solution

The fourth proportional to 813.38, 1,220.48 and 374.63 is: 562.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.38 : 1,220.48 = 374.63 : x
  2. Step 2: Convert to fraction form
    813.38/1,220.48 = 374.63/x
  3. Step 3: Cross multiply
    813.38x = 1,220.48 × 374.63
  4. Step 4: Simplify right side
    813.38x = 457,220.45
  5. Step 5: Solve for x
    x = 457,220.45/813.38
  6. Step 6: Final answer
    x = 562.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.