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Finding the Fourth Proportional to 487.23, 672.62 and 339.81

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Solution

The fourth proportional to 487.23, 672.62 and 339.81 is: 469.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.23 : 672.62 = 339.81 : x
  2. Step 2: Convert to fraction form
    487.23/672.62 = 339.81/x
  3. Step 3: Cross multiply
    487.23x = 672.62 × 339.81
  4. Step 4: Simplify right side
    487.23x = 228,561.30
  5. Step 5: Solve for x
    x = 228,561.30/487.23
  6. Step 6: Final answer
    x = 469.10

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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.