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Finding the Fourth Proportional to 1,557.37, 2,148.78 and 885.21

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Solution

The fourth proportional to 1,557.37, 2,148.78 and 885.21 is: 1,221.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,557.37 : 2,148.78 = 885.21 : x
  2. Step 2: Convert to fraction form
    1,557.37/2,148.78 = 885.21/x
  3. Step 3: Cross multiply
    1,557.37x = 2,148.78 × 885.21
  4. Step 4: Simplify right side
    1,557.37x = 1,902,121.54
  5. Step 5: Solve for x
    x = 1,902,121.54/1,557.37
  6. Step 6: Final answer
    x = 1,221.37

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1.5x scale

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.