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Finding the Fourth Proportional to 1,138.71, 1,571.43 and 666.60

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Solution

The fourth proportional to 1,138.71, 1,571.43 and 666.60 is: 919.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.71 : 1,571.43 = 666.60 : x
  2. Step 2: Convert to fraction form
    1,138.71/1,571.43 = 666.60/x
  3. Step 3: Cross multiply
    1,138.71x = 1,571.43 × 666.60
  4. Step 4: Simplify right side
    1,138.71x = 1,047,515.24
  5. Step 5: Solve for x
    x = 1,047,515.24/1,138.71
  6. Step 6: Final answer
    x = 919.91

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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.