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Finding the Fourth Proportional to 407.57, 611.15 and 285.89

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Solution

The fourth proportional to 407.57, 611.15 and 285.89 is: 428.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.57 : 611.15 = 285.89 : x
  2. Step 2: Convert to fraction form
    407.57/611.15 = 285.89/x
  3. Step 3: Cross multiply
    407.57x = 611.15 × 285.89
  4. Step 4: Simplify right side
    407.57x = 174,717.19
  5. Step 5: Solve for x
    x = 174,717.19/407.57
  6. Step 6: Final answer
    x = 428.69

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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.