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Finding the Fourth Proportional to 666.02, 919.10 and 386.25

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Solution

The fourth proportional to 666.02, 919.10 and 386.25 is: 533.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.02 : 919.10 = 386.25 : x
  2. Step 2: Convert to fraction form
    666.02/919.10 = 386.25/x
  3. Step 3: Cross multiply
    666.02x = 919.10 × 386.25
  4. Step 4: Simplify right side
    666.02x = 355,002.89
  5. Step 5: Solve for x
    x = 355,002.89/666.02
  6. Step 6: Final answer
    x = 533.02

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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.