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Finding the Fourth Proportional to 830.31, 1,245.38 and 521.22

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Solution

The fourth proportional to 830.31, 1,245.38 and 521.22 is: 781.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.31 : 1,245.38 = 521.22 : x
  2. Step 2: Convert to fraction form
    830.31/1,245.38 = 521.22/x
  3. Step 3: Cross multiply
    830.31x = 1,245.38 × 521.22
  4. Step 4: Simplify right side
    830.31x = 649,114.36
  5. Step 5: Solve for x
    x = 649,114.36/830.31
  6. Step 6: Final answer
    x = 781.77

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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.