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Finding the Fourth Proportional to 1,128.48, 1,693.44 and 754.08

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Solution

The fourth proportional to 1,128.48, 1,693.44 and 754.08 is: 1,131.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.48 : 1,693.44 = 754.08 : x
  2. Step 2: Convert to fraction form
    1,128.48/1,693.44 = 754.08/x
  3. Step 3: Cross multiply
    1,128.48x = 1,693.44 × 754.08
  4. Step 4: Simplify right side
    1,128.48x = 1,276,989.24
  5. Step 5: Solve for x
    x = 1,276,989.24/1,128.48
  6. Step 6: Final answer
    x = 1,131.60

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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.