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Finding the Fourth Proportional to 679.50, 1,019.34 and 572.58

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Solution

The fourth proportional to 679.50, 1,019.34 and 572.58 is: 858.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.50 : 1,019.34 = 572.58 : x
  2. Step 2: Convert to fraction form
    679.50/1,019.34 = 572.58/x
  3. Step 3: Cross multiply
    679.50x = 1,019.34 × 572.58
  4. Step 4: Simplify right side
    679.50x = 583,653.70
  5. Step 5: Solve for x
    x = 583,653.70/679.50
  6. Step 6: Final answer
    x = 858.95

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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.