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Finding the Fourth Proportional to 612.90, 919.71 and 247.64

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Solution

The fourth proportional to 612.90, 919.71 and 247.64 is: 371.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.90 : 919.71 = 247.64 : x
  2. Step 2: Convert to fraction form
    612.90/919.71 = 247.64/x
  3. Step 3: Cross multiply
    612.90x = 919.71 × 247.64
  4. Step 4: Simplify right side
    612.90x = 227,752.39
  5. Step 5: Solve for x
    x = 227,752.39/612.90
  6. Step 6: Final answer
    x = 371.60

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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.