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Finding the Fourth Proportional to 612.46, 918.72 and 247.20

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Solution

The fourth proportional to 612.46, 918.72 and 247.20 is: 370.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.46 : 918.72 = 247.20 : x
  2. Step 2: Convert to fraction form
    612.46/918.72 = 247.20/x
  3. Step 3: Cross multiply
    612.46x = 918.72 × 247.20
  4. Step 4: Simplify right side
    612.46x = 227,109.88
  5. Step 5: Solve for x
    x = 227,109.88/612.46
  6. Step 6: Final answer
    x = 370.82

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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.