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Finding the Fourth Proportional to 612.51, 918.81 and 247.11

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Solution

The fourth proportional to 612.51, 918.81 and 247.11 is: 370.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.51 : 918.81 = 247.11 : x
  2. Step 2: Convert to fraction form
    612.51/918.81 = 247.11/x
  3. Step 3: Cross multiply
    612.51x = 918.81 × 247.11
  4. Step 4: Simplify right side
    612.51x = 227,047.14
  5. Step 5: Solve for x
    x = 227,047.14/612.51
  6. Step 6: Final answer
    x = 370.68

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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.