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Finding the Fourth Proportional to 830.74, 1,246.38 and 397.90

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Solution

The fourth proportional to 830.74, 1,246.38 and 397.90 is: 596.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.74 : 1,246.38 = 397.90 : x
  2. Step 2: Convert to fraction form
    830.74/1,246.38 = 397.90/x
  3. Step 3: Cross multiply
    830.74x = 1,246.38 × 397.90
  4. Step 4: Simplify right side
    830.74x = 495,934.60
  5. Step 5: Solve for x
    x = 495,934.60/830.74
  6. Step 6: Final answer
    x = 596.98

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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.