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Finding the Fourth Proportional to 1,622.70, 2,434.20 and 648.60

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Solution

The fourth proportional to 1,622.70, 2,434.20 and 648.60 is: 972.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,622.70 : 2,434.20 = 648.60 : x
  2. Step 2: Convert to fraction form
    1,622.70/2,434.20 = 648.60/x
  3. Step 3: Cross multiply
    1,622.70x = 2,434.20 × 648.60
  4. Step 4: Simplify right side
    1,622.70x = 1,578,822.12
  5. Step 5: Solve for x
    x = 1,578,822.12/1,622.70
  6. Step 6: Final answer
    x = 972.96

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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.