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Finding the Fourth Proportional to 1,620.48, 2,432.40 and 891.48

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Solution

The fourth proportional to 1,620.48, 2,432.40 and 891.48 is: 1,338.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.48 : 2,432.40 = 891.48 : x
  2. Step 2: Convert to fraction form
    1,620.48/2,432.40 = 891.48/x
  3. Step 3: Cross multiply
    1,620.48x = 2,432.40 × 891.48
  4. Step 4: Simplify right side
    1,620.48x = 2,168,435.95
  5. Step 5: Solve for x
    x = 2,168,435.95/1,620.48
  6. Step 6: Final answer
    x = 1,338.14

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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.