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Finding the Fourth Proportional to 830.72, 1,246.48 and 397.36

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Solution

The fourth proportional to 830.72, 1,246.48 and 397.36 is: 596.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.72 : 1,246.48 = 397.36 : x
  2. Step 2: Convert to fraction form
    830.72/1,246.48 = 397.36/x
  3. Step 3: Cross multiply
    830.72x = 1,246.48 × 397.36
  4. Step 4: Simplify right side
    830.72x = 495,301.29
  5. Step 5: Solve for x
    x = 495,301.29/830.72
  6. Step 6: Final answer
    x = 596.23

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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.