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Finding the Fourth Proportional to 666.57, 921.20 and 569.37

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Solution

The fourth proportional to 666.57, 921.20 and 569.37 is: 786.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.57 : 921.20 = 569.37 : x
  2. Step 2: Convert to fraction form
    666.57/921.20 = 569.37/x
  3. Step 3: Cross multiply
    666.57x = 921.20 × 569.37
  4. Step 4: Simplify right side
    666.57x = 524,500.80
  5. Step 5: Solve for x
    x = 524,500.80/666.57
  6. Step 6: Final answer
    x = 786.87

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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.