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Finding the Fourth Proportional to 666.98, 920.30 and 404.85

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Solution

The fourth proportional to 666.98, 920.30 and 404.85 is: 558.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.98 : 920.30 = 404.85 : x
  2. Step 2: Convert to fraction form
    666.98/920.30 = 404.85/x
  3. Step 3: Cross multiply
    666.98x = 920.30 × 404.85
  4. Step 4: Simplify right side
    666.98x = 372,581.43
  5. Step 5: Solve for x
    x = 372,581.43/666.98
  6. Step 6: Final answer
    x = 558.61

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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.