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Finding the Fourth Proportional to 817.95, 1,227.47 and 407.45

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Solution

The fourth proportional to 817.95, 1,227.47 and 407.45 is: 611.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.95 : 1,227.47 = 407.45 : x
  2. Step 2: Convert to fraction form
    817.95/1,227.47 = 407.45/x
  3. Step 3: Cross multiply
    817.95x = 1,227.47 × 407.45
  4. Step 4: Simplify right side
    817.95x = 500,124.48
  5. Step 5: Solve for x
    x = 500,124.48/817.95
  6. Step 6: Final answer
    x = 611.44

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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.