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Finding the Fourth Proportional to 666.80, 999.72 and 474.56

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Solution

The fourth proportional to 666.80, 999.72 and 474.56 is: 711.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.80 : 999.72 = 474.56 : x
  2. Step 2: Convert to fraction form
    666.80/999.72 = 474.56/x
  3. Step 3: Cross multiply
    666.80x = 999.72 × 474.56
  4. Step 4: Simplify right side
    666.80x = 474,427.12
  5. Step 5: Solve for x
    x = 474,427.12/666.80
  6. Step 6: Final answer
    x = 711.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.