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Finding the Fourth Proportional to 666.08, 919.56 and 445.40

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Solution

The fourth proportional to 666.08, 919.56 and 445.40 is: 614.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.08 : 919.56 = 445.40 : x
  2. Step 2: Convert to fraction form
    666.08/919.56 = 445.40/x
  3. Step 3: Cross multiply
    666.08x = 919.56 × 445.40
  4. Step 4: Simplify right side
    666.08x = 409,572.02
  5. Step 5: Solve for x
    x = 409,572.02/666.08
  6. Step 6: Final answer
    x = 614.90

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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.