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Finding the Fourth Proportional to 1,108.66, 1,529.96 and 666.57

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Solution

The fourth proportional to 1,108.66, 1,529.96 and 666.57 is: 919.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.66 : 1,529.96 = 666.57 : x
  2. Step 2: Convert to fraction form
    1,108.66/1,529.96 = 666.57/x
  3. Step 3: Cross multiply
    1,108.66x = 1,529.96 × 666.57
  4. Step 4: Simplify right side
    1,108.66x = 1,019,825.44
  5. Step 5: Solve for x
    x = 1,019,825.44/1,108.66
  6. Step 6: Final answer
    x = 919.87

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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.