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Finding the Fourth Proportional to 666.60, 920.01 and 386.93

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Solution

The fourth proportional to 666.60, 920.01 and 386.93 is: 534.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.60 : 920.01 = 386.93 : x
  2. Step 2: Convert to fraction form
    666.60/920.01 = 386.93/x
  3. Step 3: Cross multiply
    666.60x = 920.01 × 386.93
  4. Step 4: Simplify right side
    666.60x = 355,974.87
  5. Step 5: Solve for x
    x = 355,974.87/666.60
  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.