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Finding the Fourth Proportional to 666.68, 920.25 and 439.57

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Solution

The fourth proportional to 666.68, 920.25 and 439.57 is: 606.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.68 : 920.25 = 439.57 : x
  2. Step 2: Convert to fraction form
    666.68/920.25 = 439.57/x
  3. Step 3: Cross multiply
    666.68x = 920.25 × 439.57
  4. Step 4: Simplify right side
    666.68x = 404,516.04
  5. Step 5: Solve for x
    x = 404,516.04/666.68
  6. Step 6: Final answer
    x = 606.77

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1.5x scale

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.