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Finding the Fourth Proportional to 578.90, 866.19 and 572.42

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Solution

The fourth proportional to 578.90, 866.19 and 572.42 is: 856.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.90 : 866.19 = 572.42 : x
  2. Step 2: Convert to fraction form
    578.90/866.19 = 572.42/x
  3. Step 3: Cross multiply
    578.90x = 866.19 × 572.42
  4. Step 4: Simplify right side
    578.90x = 495,824.48
  5. Step 5: Solve for x
    x = 495,824.48/578.90
  6. Step 6: Final answer
    x = 856.49

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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.