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Finding the Fourth Proportional to 666.16, 919.15 and 386.24

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Solution

The fourth proportional to 666.16, 919.15 and 386.24 is: 532.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.16 : 919.15 = 386.24 : x
  2. Step 2: Convert to fraction form
    666.16/919.15 = 386.24/x
  3. Step 3: Cross multiply
    666.16x = 919.15 × 386.24
  4. Step 4: Simplify right side
    666.16x = 355,008.87
  5. Step 5: Solve for x
    x = 355,008.87/666.16
  6. Step 6: Final answer
    x = 532.92

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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.