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Finding the Fourth Proportional to 679.68, 1,018.56 and 371.40

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Solution

The fourth proportional to 679.68, 1,018.56 and 371.40 is: 556.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.68 : 1,018.56 = 371.40 : x
  2. Step 2: Convert to fraction form
    679.68/1,018.56 = 371.40/x
  3. Step 3: Cross multiply
    679.68x = 1,018.56 × 371.40
  4. Step 4: Simplify right side
    679.68x = 378,293.18
  5. Step 5: Solve for x
    x = 378,293.18/679.68
  6. Step 6: Final answer
    x = 556.58

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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.