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Finding the Fourth Proportional to 1,220.40, 1,830.84 and 398.68

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Solution

The fourth proportional to 1,220.40, 1,830.84 and 398.68 is: 598.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.40 : 1,830.84 = 398.68 : x
  2. Step 2: Convert to fraction form
    1,220.40/1,830.84 = 398.68/x
  3. Step 3: Cross multiply
    1,220.40x = 1,830.84 × 398.68
  4. Step 4: Simplify right side
    1,220.40x = 729,919.29
  5. Step 5: Solve for x
    x = 729,919.29/1,220.40
  6. Step 6: Final answer
    x = 598.10

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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.