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Finding the Fourth Proportional to 474.80, 715.79 and 406.88

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Solution

The fourth proportional to 474.80, 715.79 and 406.88 is: 613.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.80 : 715.79 = 406.88 : x
  2. Step 2: Convert to fraction form
    474.80/715.79 = 406.88/x
  3. Step 3: Cross multiply
    474.80x = 715.79 × 406.88
  4. Step 4: Simplify right side
    474.80x = 291,240.64
  5. Step 5: Solve for x
    x = 291,240.64/474.80
  6. Step 6: Final answer
    x = 613.40

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.