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Finding the Fourth Proportional to 900.92, 1,243.20 and 551.60

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Solution

The fourth proportional to 900.92, 1,243.20 and 551.60 is: 761.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.92 : 1,243.20 = 551.60 : x
  2. Step 2: Convert to fraction form
    900.92/1,243.20 = 551.60/x
  3. Step 3: Cross multiply
    900.92x = 1,243.20 × 551.60
  4. Step 4: Simplify right side
    900.92x = 685,749.12
  5. Step 5: Solve for x
    x = 685,749.12/900.92
  6. Step 6: Final answer
    x = 761.17

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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.