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Finding the Fourth Proportional to 679.67, 1,018.70 and 289.55

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Solution

The fourth proportional to 679.67, 1,018.70 and 289.55 is: 433.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.67 : 1,018.70 = 289.55 : x
  2. Step 2: Convert to fraction form
    679.67/1,018.70 = 289.55/x
  3. Step 3: Cross multiply
    679.67x = 1,018.70 × 289.55
  4. Step 4: Simplify right side
    679.67x = 294,967.86
  5. Step 5: Solve for x
    x = 294,967.86/679.67
  6. Step 6: Final answer
    x = 433.99

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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.