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Finding the Fourth Proportional to 1,138.56, 1,571.13 and 666.48

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Solution

The fourth proportional to 1,138.56, 1,571.13 and 666.48 is: 919.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.56 : 1,571.13 = 666.48 : x
  2. Step 2: Convert to fraction form
    1,138.56/1,571.13 = 666.48/x
  3. Step 3: Cross multiply
    1,138.56x = 1,571.13 × 666.48
  4. Step 4: Simplify right side
    1,138.56x = 1,047,126.72
  5. Step 5: Solve for x
    x = 1,047,126.72/1,138.56
  6. Step 6: Final answer
    x = 919.69

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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.