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Finding the Fourth Proportional to 666.70, 920.04 and 386.99

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Solution

The fourth proportional to 666.70, 920.04 and 386.99 is: 534.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.70 : 920.04 = 386.99 : x
  2. Step 2: Convert to fraction form
    666.70/920.04 = 386.99/x
  3. Step 3: Cross multiply
    666.70x = 920.04 × 386.99
  4. Step 4: Simplify right side
    666.70x = 356,046.28
  5. Step 5: Solve for x
    x = 356,046.28/666.70
  6. Step 6: Final answer
    x = 534.04

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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.