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Finding the Fourth Proportional to 666.72, 920.12 and 386.96

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Solution

The fourth proportional to 666.72, 920.12 and 386.96 is: 534.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.72 : 920.12 = 386.96 : x
  2. Step 2: Convert to fraction form
    666.72/920.12 = 386.96/x
  3. Step 3: Cross multiply
    666.72x = 920.12 × 386.96
  4. Step 4: Simplify right side
    666.72x = 356,049.64
  5. Step 5: Solve for x
    x = 356,049.64/666.72
  6. Step 6: Final answer
    x = 534.03

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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.