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Finding the Fourth Proportional to 1,128.78, 1,557.63 and 662.94

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Solution

The fourth proportional to 1,128.78, 1,557.63 and 662.94 is: 914.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.78 : 1,557.63 = 662.94 : x
  2. Step 2: Convert to fraction form
    1,128.78/1,557.63 = 662.94/x
  3. Step 3: Cross multiply
    1,128.78x = 1,557.63 × 662.94
  4. Step 4: Simplify right side
    1,128.78x = 1,032,615.23
  5. Step 5: Solve for x
    x = 1,032,615.23/1,128.78
  6. Step 6: Final answer
    x = 914.81

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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.