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Finding the Fourth Proportional to 612.11, 917.87 and 319.57

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Solution

The fourth proportional to 612.11, 917.87 and 319.57 is: 479.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.11 : 917.87 = 319.57 : x
  2. Step 2: Convert to fraction form
    612.11/917.87 = 319.57/x
  3. Step 3: Cross multiply
    612.11x = 917.87 × 319.57
  4. Step 4: Simplify right side
    612.11x = 293,319.82
  5. Step 5: Solve for x
    x = 293,319.82/612.11
  6. Step 6: Final answer
    x = 479.19

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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.