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Finding the Fourth Proportional to 666.67, 920.46 and 434.20

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Solution

The fourth proportional to 666.67, 920.46 and 434.20 is: 599.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.67 : 920.46 = 434.20 : x
  2. Step 2: Convert to fraction form
    666.67/920.46 = 434.20/x
  3. Step 3: Cross multiply
    666.67x = 920.46 × 434.20
  4. Step 4: Simplify right side
    666.67x = 399,663.73
  5. Step 5: Solve for x
    x = 399,663.73/666.67
  6. Step 6: Final answer
    x = 599.49

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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.