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Finding the Fourth Proportional to 977.28, 1,348.56 and 551.94

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Solution

The fourth proportional to 977.28, 1,348.56 and 551.94 is: 761.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.28 : 1,348.56 = 551.94 : x
  2. Step 2: Convert to fraction form
    977.28/1,348.56 = 551.94/x
  3. Step 3: Cross multiply
    977.28x = 1,348.56 × 551.94
  4. Step 4: Simplify right side
    977.28x = 744,324.21
  5. Step 5: Solve for x
    x = 744,324.21/977.28
  6. Step 6: Final answer
    x = 761.63

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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.