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Finding the Fourth Proportional to 666.34, 999.50 and 436.09

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Solution

The fourth proportional to 666.34, 999.50 and 436.09 is: 654.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.34 : 999.50 = 436.09 : x
  2. Step 2: Convert to fraction form
    666.34/999.50 = 436.09/x
  3. Step 3: Cross multiply
    666.34x = 999.50 × 436.09
  4. Step 4: Simplify right side
    666.34x = 435,871.96
  5. Step 5: Solve for x
    x = 435,871.96/666.34
  6. Step 6: Final answer
    x = 654.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.