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Finding the Fourth Proportional to 1,128.44, 1,557.06 and 662.78

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Solution

The fourth proportional to 1,128.44, 1,557.06 and 662.78 is: 914.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.44 : 1,557.06 = 662.78 : x
  2. Step 2: Convert to fraction form
    1,128.44/1,557.06 = 662.78/x
  3. Step 3: Cross multiply
    1,128.44x = 1,557.06 × 662.78
  4. Step 4: Simplify right side
    1,128.44x = 1,031,988.23
  5. Step 5: Solve for x
    x = 1,031,988.23/1,128.44
  6. Step 6: Final answer
    x = 914.53

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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.