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Finding the Fourth Proportional to 666.74, 920.00 and 386.93

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Solution

The fourth proportional to 666.74, 920.00 and 386.93 is: 533.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.74 : 920.00 = 386.93 : x
  2. Step 2: Convert to fraction form
    666.74/920.00 = 386.93/x
  3. Step 3: Cross multiply
    666.74x = 920.00 × 386.93
  4. Step 4: Simplify right side
    666.74x = 355,969.07
  5. Step 5: Solve for x
    x = 355,969.07/666.74
  6. Step 6: Final answer
    x = 533.90

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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.