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Finding the Fourth Proportional to 621.74, 927.36 and 529.40

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Solution

The fourth proportional to 621.74, 927.36 and 529.40 is: 789.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.74 : 927.36 = 529.40 : x
  2. Step 2: Convert to fraction form
    621.74/927.36 = 529.40/x
  3. Step 3: Cross multiply
    621.74x = 927.36 × 529.40
  4. Step 4: Simplify right side
    621.74x = 490,946.70
  5. Step 5: Solve for x
    x = 490,946.70/621.74
  6. Step 6: Final answer
    x = 789.63

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.