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Finding the Fourth Proportional to 830.74, 1,246.95 and 398.26

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Solution

The fourth proportional to 830.74, 1,246.95 and 398.26 is: 597.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.74 : 1,246.95 = 398.26 : x
  2. Step 2: Convert to fraction form
    830.74/1,246.95 = 398.26/x
  3. Step 3: Cross multiply
    830.74x = 1,246.95 × 398.26
  4. Step 4: Simplify right side
    830.74x = 496,610.31
  5. Step 5: Solve for x
    x = 496,610.31/830.74
  6. Step 6: Final answer
    x = 597.79

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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.