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Finding the Fourth Proportional to 900.62, 1,242.78 and 551.24

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Solution

The fourth proportional to 900.62, 1,242.78 and 551.24 is: 760.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.62 : 1,242.78 = 551.24 : x
  2. Step 2: Convert to fraction form
    900.62/1,242.78 = 551.24/x
  3. Step 3: Cross multiply
    900.62x = 1,242.78 × 551.24
  4. Step 4: Simplify right side
    900.62x = 685,070.05
  5. Step 5: Solve for x
    x = 685,070.05/900.62
  6. Step 6: Final answer
    x = 760.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.