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Finding the Fourth Proportional to 487.42, 672.69 and 300.87

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Solution

The fourth proportional to 487.42, 672.69 and 300.87 is: 415.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.42 : 672.69 = 300.87 : x
  2. Step 2: Convert to fraction form
    487.42/672.69 = 300.87/x
  3. Step 3: Cross multiply
    487.42x = 672.69 × 300.87
  4. Step 4: Simplify right side
    487.42x = 202,392.24
  5. Step 5: Solve for x
    x = 202,392.24/487.42
  6. Step 6: Final answer
    x = 415.24

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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.