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Finding the Fourth Proportional to 1,220.78, 1,830.61 and 354.89

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Solution

The fourth proportional to 1,220.78, 1,830.61 and 354.89 is: 532.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.78 : 1,830.61 = 354.89 : x
  2. Step 2: Convert to fraction form
    1,220.78/1,830.61 = 354.89/x
  3. Step 3: Cross multiply
    1,220.78x = 1,830.61 × 354.89
  4. Step 4: Simplify right side
    1,220.78x = 649,665.18
  5. Step 5: Solve for x
    x = 649,665.18/1,220.78
  6. Step 6: Final answer
    x = 532.17

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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.