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Finding the Fourth Proportional to 487.87, 672.87 and 313

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Solution

The fourth proportional to 487.87, 672.87 and 313 is: 431.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.87 : 672.87 = 313 : x
  2. Step 2: Convert to fraction form
    487.87/672.87 = 313/x
  3. Step 3: Cross multiply
    487.87x = 672.87 × 313
  4. Step 4: Simplify right side
    487.87x = 210,608.31
  5. Step 5: Solve for x
    x = 210,608.31/487.87
  6. Step 6: Final answer
    x = 431.69

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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.