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Finding the Fourth Proportional to 618.32, 851.81 and 431.47

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Solution

The fourth proportional to 618.32, 851.81 and 431.47 is: 594.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.32 : 851.81 = 431.47 : x
  2. Step 2: Convert to fraction form
    618.32/851.81 = 431.47/x
  3. Step 3: Cross multiply
    618.32x = 851.81 × 431.47
  4. Step 4: Simplify right side
    618.32x = 367,530.46
  5. Step 5: Solve for x
    x = 367,530.46/618.32
  6. Step 6: Final answer
    x = 594.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.