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Finding the Fourth Proportional to 620.40, 928.23 and 551.13

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Solution

The fourth proportional to 620.40, 928.23 and 551.13 is: 824.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.40 : 928.23 = 551.13 : x
  2. Step 2: Convert to fraction form
    620.40/928.23 = 551.13/x
  3. Step 3: Cross multiply
    620.40x = 928.23 × 551.13
  4. Step 4: Simplify right side
    620.40x = 511,575.40
  5. Step 5: Solve for x
    x = 511,575.40/620.40
  6. Step 6: Final answer
    x = 824.59

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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.