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Finding the Fourth Proportional to 407.16, 611.10 and 285.48

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Solution

The fourth proportional to 407.16, 611.10 and 285.48 is: 428.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.16 : 611.10 = 285.48 : x
  2. Step 2: Convert to fraction form
    407.16/611.10 = 285.48/x
  3. Step 3: Cross multiply
    407.16x = 611.10 × 285.48
  4. Step 4: Simplify right side
    407.16x = 174,456.83
  5. Step 5: Solve for x
    x = 174,456.83/407.16
  6. Step 6: Final answer
    x = 428.47

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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.