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Finding the Fourth Proportional to 666.66, 920.05 and 386.95

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Solution

The fourth proportional to 666.66, 920.05 and 386.95 is: 534.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.66 : 920.05 = 386.95 : x
  2. Step 2: Convert to fraction form
    666.66/920.05 = 386.95/x
  3. Step 3: Cross multiply
    666.66x = 920.05 × 386.95
  4. Step 4: Simplify right side
    666.66x = 356,008.75
  5. Step 5: Solve for x
    x = 356,008.75/666.66
  6. Step 6: Final answer
    x = 534.02

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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.