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Finding the Fourth Proportional to 631.69, 872.04 and 521.80

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Solution

The fourth proportional to 631.69, 872.04 and 521.80 is: 720.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.69 : 872.04 = 521.80 : x
  2. Step 2: Convert to fraction form
    631.69/872.04 = 521.80/x
  3. Step 3: Cross multiply
    631.69x = 872.04 × 521.80
  4. Step 4: Simplify right side
    631.69x = 455,030.47
  5. Step 5: Solve for x
    x = 455,030.47/631.69
  6. Step 6: Final answer
    x = 720.34

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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.