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Finding the Fourth Proportional to 666.83, 920.67 and 445.70

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Solution

The fourth proportional to 666.83, 920.67 and 445.70 is: 615.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.83 : 920.67 = 445.70 : x
  2. Step 2: Convert to fraction form
    666.83/920.67 = 445.70/x
  3. Step 3: Cross multiply
    666.83x = 920.67 × 445.70
  4. Step 4: Simplify right side
    666.83x = 410,343.25
  5. Step 5: Solve for x
    x = 410,343.25/666.83
  6. Step 6: Final answer
    x = 615.36

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Double scale
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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.