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Finding the Fourth Proportional to 487.36, 672.40 and 339.92

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Solution

The fourth proportional to 487.36, 672.40 and 339.92 is: 468.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.36 : 672.40 = 339.92 : x
  2. Step 2: Convert to fraction form
    487.36/672.40 = 339.92/x
  3. Step 3: Cross multiply
    487.36x = 672.40 × 339.92
  4. Step 4: Simplify right side
    487.36x = 228,562.21
  5. Step 5: Solve for x
    x = 228,562.21/487.36
  6. Step 6: Final answer
    x = 468.98

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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.