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Finding the Fourth Proportional to 666.72, 920.10 and 371.99

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Solution

The fourth proportional to 666.72, 920.10 and 371.99 is: 513.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.72 : 920.10 = 371.99 : x
  2. Step 2: Convert to fraction form
    666.72/920.10 = 371.99/x
  3. Step 3: Cross multiply
    666.72x = 920.10 × 371.99
  4. Step 4: Simplify right side
    666.72x = 342,263.40
  5. Step 5: Solve for x
    x = 342,263.40/666.72
  6. Step 6: Final answer
    x = 513.35

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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.