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Finding the Fourth Proportional to 399.34, 595.64 and 387.19

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Solution

The fourth proportional to 399.34, 595.64 and 387.19 is: 577.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.34 : 595.64 = 387.19 : x
  2. Step 2: Convert to fraction form
    399.34/595.64 = 387.19/x
  3. Step 3: Cross multiply
    399.34x = 595.64 × 387.19
  4. Step 4: Simplify right side
    399.34x = 230,625.85
  5. Step 5: Solve for x
    x = 230,625.85/399.34
  6. Step 6: Final answer
    x = 577.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.