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Finding the Fourth Proportional to 1,163.89, 1,606.39 and 666.86

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Solution

The fourth proportional to 1,163.89, 1,606.39 and 666.86 is: 920.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,163.89 : 1,606.39 = 666.86 : x
  2. Step 2: Convert to fraction form
    1,163.89/1,606.39 = 666.86/x
  3. Step 3: Cross multiply
    1,163.89x = 1,606.39 × 666.86
  4. Step 4: Simplify right side
    1,163.89x = 1,071,233.93
  5. Step 5: Solve for x
    x = 1,071,233.93/1,163.89
  6. Step 6: Final answer
    x = 920.39

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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.