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Finding the Fourth Proportional to 572.72, 858.71 and 389.55

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Solution

The fourth proportional to 572.72, 858.71 and 389.55 is: 584.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.72 : 858.71 = 389.55 : x
  2. Step 2: Convert to fraction form
    572.72/858.71 = 389.55/x
  3. Step 3: Cross multiply
    572.72x = 858.71 × 389.55
  4. Step 4: Simplify right side
    572.72x = 334,511.45
  5. Step 5: Solve for x
    x = 334,511.45/572.72
  6. Step 6: Final answer
    x = 584.08

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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.