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Finding the Fourth Proportional to 900.89, 1,243.38 and 551.78

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Solution

The fourth proportional to 900.89, 1,243.38 and 551.78 is: 761.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.89 : 1,243.38 = 551.78 : x
  2. Step 2: Convert to fraction form
    900.89/1,243.38 = 551.78/x
  3. Step 3: Cross multiply
    900.89x = 1,243.38 × 551.78
  4. Step 4: Simplify right side
    900.89x = 686,066.00
  5. Step 5: Solve for x
    x = 686,066.00/900.89
  6. Step 6: Final answer
    x = 761.55

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1.5x scale

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.