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Finding the Fourth Proportional to 940.72, 1,412.13 and 551.18

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Solution

The fourth proportional to 940.72, 1,412.13 and 551.18 is: 827.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.72 : 1,412.13 = 551.18 : x
  2. Step 2: Convert to fraction form
    940.72/1,412.13 = 551.18/x
  3. Step 3: Cross multiply
    940.72x = 1,412.13 × 551.18
  4. Step 4: Simplify right side
    940.72x = 778,337.81
  5. Step 5: Solve for x
    x = 778,337.81/940.72
  6. Step 6: Final answer
    x = 827.39

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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.