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Finding the Fourth Proportional to 666.12, 919.10 and 429.69

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Solution

The fourth proportional to 666.12, 919.10 and 429.69 is: 592.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.12 : 919.10 = 429.69 : x
  2. Step 2: Convert to fraction form
    666.12/919.10 = 429.69/x
  3. Step 3: Cross multiply
    666.12x = 919.10 × 429.69
  4. Step 4: Simplify right side
    666.12x = 394,925.93
  5. Step 5: Solve for x
    x = 394,925.93/666.12
  6. Step 6: Final answer
    x = 592.88

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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.