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Finding the Fourth Proportional to 666.92, 999.34 and 435.40

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Solution

The fourth proportional to 666.92, 999.34 and 435.40 is: 652.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.92 : 999.34 = 435.40 : x
  2. Step 2: Convert to fraction form
    666.92/999.34 = 435.40/x
  3. Step 3: Cross multiply
    666.92x = 999.34 × 435.40
  4. Step 4: Simplify right side
    666.92x = 435,112.64
  5. Step 5: Solve for x
    x = 435,112.64/666.92
  6. Step 6: Final answer
    x = 652.42

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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.