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Finding the Fourth Proportional to 830.26, 1,244.76 and 419.20

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Solution

The fourth proportional to 830.26, 1,244.76 and 419.20 is: 628.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.26 : 1,244.76 = 419.20 : x
  2. Step 2: Convert to fraction form
    830.26/1,244.76 = 419.20/x
  3. Step 3: Cross multiply
    830.26x = 1,244.76 × 419.20
  4. Step 4: Simplify right side
    830.26x = 521,803.39
  5. Step 5: Solve for x
    x = 521,803.39/830.26
  6. Step 6: Final answer
    x = 628.48

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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.