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Finding the Fourth Proportional to 761.70, 1,052.07 and 551.54

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Solution

The fourth proportional to 761.70, 1,052.07 and 551.54 is: 761.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.70 : 1,052.07 = 551.54 : x
  2. Step 2: Convert to fraction form
    761.70/1,052.07 = 551.54/x
  3. Step 3: Cross multiply
    761.70x = 1,052.07 × 551.54
  4. Step 4: Simplify right side
    761.70x = 580,253.43
  5. Step 5: Solve for x
    x = 580,253.43/761.70
  6. Step 6: Final answer
    x = 761.79

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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.