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Finding the Fourth Proportional to 1,220.76, 1,830.72 and 398.83

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Solution

The fourth proportional to 1,220.76, 1,830.72 and 398.83 is: 598.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.76 : 1,830.72 = 398.83 : x
  2. Step 2: Convert to fraction form
    1,220.76/1,830.72 = 398.83/x
  3. Step 3: Cross multiply
    1,220.76x = 1,830.72 × 398.83
  4. Step 4: Simplify right side
    1,220.76x = 730,146.06
  5. Step 5: Solve for x
    x = 730,146.06/1,220.76
  6. Step 6: Final answer
    x = 598.11

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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.