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Finding the Fourth Proportional to 830.38, 1,245.63 and 419.29

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Solution

The fourth proportional to 830.38, 1,245.63 and 419.29 is: 628.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.38 : 1,245.63 = 419.29 : x
  2. Step 2: Convert to fraction form
    830.38/1,245.63 = 419.29/x
  3. Step 3: Cross multiply
    830.38x = 1,245.63 × 419.29
  4. Step 4: Simplify right side
    830.38x = 522,280.20
  5. Step 5: Solve for x
    x = 522,280.20/830.38
  6. Step 6: Final answer
    x = 628.97

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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.