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Finding the Fourth Proportional to 666.19, 919.30 and 371.45

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Solution

The fourth proportional to 666.19, 919.30 and 371.45 is: 512.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.19 : 919.30 = 371.45 : x
  2. Step 2: Convert to fraction form
    666.19/919.30 = 371.45/x
  3. Step 3: Cross multiply
    666.19x = 919.30 × 371.45
  4. Step 4: Simplify right side
    666.19x = 341,476.05
  5. Step 5: Solve for x
    x = 341,476.05/666.19
  6. Step 6: Final answer
    x = 512.58

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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.