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Finding the Fourth Proportional to 1,554.48, 2,145 and 891.28

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Solution

The fourth proportional to 1,554.48, 2,145 and 891.28 is: 1,229.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,554.48 : 2,145 = 891.28 : x
  2. Step 2: Convert to fraction form
    1,554.48/2,145 = 891.28/x
  3. Step 3: Cross multiply
    1,554.48x = 2,145 × 891.28
  4. Step 4: Simplify right side
    1,554.48x = 1,911,795.60
  5. Step 5: Solve for x
    x = 1,911,795.60/1,554.48
  6. Step 6: Final answer
    x = 1,229.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.