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Finding the Fourth Proportional to 900.88, 1,243.14 and 551.50

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Solution

The fourth proportional to 900.88, 1,243.14 and 551.50 is: 761.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.88 : 1,243.14 = 551.50 : x
  2. Step 2: Convert to fraction form
    900.88/1,243.14 = 551.50/x
  3. Step 3: Cross multiply
    900.88x = 1,243.14 × 551.50
  4. Step 4: Simplify right side
    900.88x = 685,591.71
  5. Step 5: Solve for x
    x = 685,591.71/900.88
  6. Step 6: Final answer
    x = 761.02

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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.