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Finding the Fourth Proportional to 487.59, 672.26 and 393.99

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Solution

The fourth proportional to 487.59, 672.26 and 393.99 is: 543.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.59 : 672.26 = 393.99 : x
  2. Step 2: Convert to fraction form
    487.59/672.26 = 393.99/x
  3. Step 3: Cross multiply
    487.59x = 672.26 × 393.99
  4. Step 4: Simplify right side
    487.59x = 264,860.36
  5. Step 5: Solve for x
    x = 264,860.36/487.59
  6. Step 6: Final answer
    x = 543.21

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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.