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Finding the Fourth Proportional to 679.35, 1,019.43 and 558.66

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Solution

The fourth proportional to 679.35, 1,019.43 and 558.66 is: 838.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.35 : 1,019.43 = 558.66 : x
  2. Step 2: Convert to fraction form
    679.35/1,019.43 = 558.66/x
  3. Step 3: Cross multiply
    679.35x = 1,019.43 × 558.66
  4. Step 4: Simplify right side
    679.35x = 569,514.76
  5. Step 5: Solve for x
    x = 569,514.76/679.35
  6. Step 6: Final answer
    x = 838.32

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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.