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Finding the Fourth Proportional to 407.28, 612 and 395.40

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Solution

The fourth proportional to 407.28, 612 and 395.40 is: 594.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.28 : 612 = 395.40 : x
  2. Step 2: Convert to fraction form
    407.28/612 = 395.40/x
  3. Step 3: Cross multiply
    407.28x = 612 × 395.40
  4. Step 4: Simplify right side
    407.28x = 241,984.80
  5. Step 5: Solve for x
    x = 241,984.80/407.28
  6. Step 6: Final answer
    x = 594.15

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