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Finding the Fourth Proportional to 679.61, 1,020.03 and 355.21

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Solution

The fourth proportional to 679.61, 1,020.03 and 355.21 is: 533.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.61 : 1,020.03 = 355.21 : x
  2. Step 2: Convert to fraction form
    679.61/1,020.03 = 355.21/x
  3. Step 3: Cross multiply
    679.61x = 1,020.03 × 355.21
  4. Step 4: Simplify right side
    679.61x = 362,320.97
  5. Step 5: Solve for x
    x = 362,320.97/679.61
  6. Step 6: Final answer
    x = 533.13

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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.