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Finding the Fourth Proportional to 611.89, 917.42 and 315.58

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Solution

The fourth proportional to 611.89, 917.42 and 315.58 is: 473.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.89 : 917.42 = 315.58 : x
  2. Step 2: Convert to fraction form
    611.89/917.42 = 315.58/x
  3. Step 3: Cross multiply
    611.89x = 917.42 × 315.58
  4. Step 4: Simplify right side
    611.89x = 289,520.88
  5. Step 5: Solve for x
    x = 289,520.88/611.89
  6. Step 6: Final answer
    x = 473.16

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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.