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Finding the Fourth Proportional to 623.28, 930.30 and 551.16

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Solution

The fourth proportional to 623.28, 930.30 and 551.16 is: 822.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.28 : 930.30 = 551.16 : x
  2. Step 2: Convert to fraction form
    623.28/930.30 = 551.16/x
  3. Step 3: Cross multiply
    623.28x = 930.30 × 551.16
  4. Step 4: Simplify right side
    623.28x = 512,744.15
  5. Step 5: Solve for x
    x = 512,744.15/623.28
  6. Step 6: Final answer
    x = 822.65

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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.