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Finding the Fourth Proportional to 1,138.12, 1,571.14 and 665.96

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Solution

The fourth proportional to 1,138.12, 1,571.14 and 665.96 is: 919.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.12 : 1,571.14 = 665.96 : x
  2. Step 2: Convert to fraction form
    1,138.12/1,571.14 = 665.96/x
  3. Step 3: Cross multiply
    1,138.12x = 1,571.14 × 665.96
  4. Step 4: Simplify right side
    1,138.12x = 1,046,316.39
  5. Step 5: Solve for x
    x = 1,046,316.39/1,138.12
  6. Step 6: Final answer
    x = 919.34

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1.5x scale

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.