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Finding the Fourth Proportional to 667.19, 998.75 and 521.39

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Solution

The fourth proportional to 667.19, 998.75 and 521.39 is: 780.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.19 : 998.75 = 521.39 : x
  2. Step 2: Convert to fraction form
    667.19/998.75 = 521.39/x
  3. Step 3: Cross multiply
    667.19x = 998.75 × 521.39
  4. Step 4: Simplify right side
    667.19x = 520,730.66
  5. Step 5: Solve for x
    x = 520,730.66/667.19
  6. Step 6: Final answer
    x = 780.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.