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Finding the Fourth Proportional to 572.79, 857.64 and 399.09

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Solution

The fourth proportional to 572.79, 857.64 and 399.09 is: 597.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.79 : 857.64 = 399.09 : x
  2. Step 2: Convert to fraction form
    572.79/857.64 = 399.09/x
  3. Step 3: Cross multiply
    572.79x = 857.64 × 399.09
  4. Step 4: Simplify right side
    572.79x = 342,275.55
  5. Step 5: Solve for x
    x = 342,275.55/572.79
  6. Step 6: Final answer
    x = 597.56

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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.