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Finding the Fourth Proportional to 1,622.78, 2,434.20 and 648.80

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Solution

The fourth proportional to 1,622.78, 2,434.20 and 648.80 is: 973.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,622.78 : 2,434.20 = 648.80 : x
  2. Step 2: Convert to fraction form
    1,622.78/2,434.20 = 648.80/x
  3. Step 3: Cross multiply
    1,622.78x = 2,434.20 × 648.80
  4. Step 4: Simplify right side
    1,622.78x = 1,579,308.96
  5. Step 5: Solve for x
    x = 1,579,308.96/1,622.78
  6. Step 6: Final answer
    x = 973.21

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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.