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Finding the Fourth Proportional to 572.82, 858.02 and 390.57

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Solution

The fourth proportional to 572.82, 858.02 and 390.57 is: 585.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.82 : 858.02 = 390.57 : x
  2. Step 2: Convert to fraction form
    572.82/858.02 = 390.57/x
  3. Step 3: Cross multiply
    572.82x = 858.02 × 390.57
  4. Step 4: Simplify right side
    572.82x = 335,114.92
  5. Step 5: Solve for x
    x = 335,114.92/572.82
  6. Step 6: Final answer
    x = 585.03

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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.