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Finding the Fourth Proportional to 697.34, 1,043.80 and 371.72

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Solution

The fourth proportional to 697.34, 1,043.80 and 371.72 is: 556.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.34 : 1,043.80 = 371.72 : x
  2. Step 2: Convert to fraction form
    697.34/1,043.80 = 371.72/x
  3. Step 3: Cross multiply
    697.34x = 1,043.80 × 371.72
  4. Step 4: Simplify right side
    697.34x = 388,001.34
  5. Step 5: Solve for x
    x = 388,001.34/697.34
  6. Step 6: Final answer
    x = 556.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.