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Finding the Fourth Proportional to 487.09, 672.33 and 339.77

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Solution

The fourth proportional to 487.09, 672.33 and 339.77 is: 468.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.09 : 672.33 = 339.77 : x
  2. Step 2: Convert to fraction form
    487.09/672.33 = 339.77/x
  3. Step 3: Cross multiply
    487.09x = 672.33 × 339.77
  4. Step 4: Simplify right side
    487.09x = 228,437.56
  5. Step 5: Solve for x
    x = 228,437.56/487.09
  6. Step 6: Final answer
    x = 468.99

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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.