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Finding the Fourth Proportional to 478.80, 718.19 and 247.64

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Solution

The fourth proportional to 478.80, 718.19 and 247.64 is: 371.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.80 : 718.19 = 247.64 : x
  2. Step 2: Convert to fraction form
    478.80/718.19 = 247.64/x
  3. Step 3: Cross multiply
    478.80x = 718.19 × 247.64
  4. Step 4: Simplify right side
    478.80x = 177,852.57
  5. Step 5: Solve for x
    x = 177,852.57/478.80
  6. Step 6: Final answer
    x = 371.45

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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.