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Finding the Fourth Proportional to 830.69, 1,245.96 and 253.57

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Solution

The fourth proportional to 830.69, 1,245.96 and 253.57 is: 380.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.69 : 1,245.96 = 253.57 : x
  2. Step 2: Convert to fraction form
    830.69/1,245.96 = 253.57/x
  3. Step 3: Cross multiply
    830.69x = 1,245.96 × 253.57
  4. Step 4: Simplify right side
    830.69x = 315,938.08
  5. Step 5: Solve for x
    x = 315,938.08/830.69
  6. Step 6: Final answer
    x = 380.33

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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.