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Finding the Fourth Proportional to 666.41, 919.96 and 470.39

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Solution

The fourth proportional to 666.41, 919.96 and 470.39 is: 649.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.41 : 919.96 = 470.39 : x
  2. Step 2: Convert to fraction form
    666.41/919.96 = 470.39/x
  3. Step 3: Cross multiply
    666.41x = 919.96 × 470.39
  4. Step 4: Simplify right side
    666.41x = 432,734.21
  5. Step 5: Solve for x
    x = 432,734.21/666.41
  6. Step 6: Final answer
    x = 649.36

Related Problems

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Half scale
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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.