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Finding the Fourth Proportional to 407.95, 611.52 and 286.18

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Solution

The fourth proportional to 407.95, 611.52 and 286.18 is: 428.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.95 : 611.52 = 286.18 : x
  2. Step 2: Convert to fraction form
    407.95/611.52 = 286.18/x
  3. Step 3: Cross multiply
    407.95x = 611.52 × 286.18
  4. Step 4: Simplify right side
    407.95x = 175,004.79
  5. Step 5: Solve for x
    x = 175,004.79/407.95
  6. Step 6: Final answer
    x = 428.99

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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.