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Finding the Fourth Proportional to 666.20, 919.47 and 417.62

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Solution

The fourth proportional to 666.20, 919.47 and 417.62 is: 576.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.20 : 919.47 = 417.62 : x
  2. Step 2: Convert to fraction form
    666.20/919.47 = 417.62/x
  3. Step 3: Cross multiply
    666.20x = 919.47 × 417.62
  4. Step 4: Simplify right side
    666.20x = 383,989.06
  5. Step 5: Solve for x
    x = 383,989.06/666.20
  6. Step 6: Final answer
    x = 576.39

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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.