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Finding the Fourth Proportional to 656.81, 985.36 and 272.06

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Solution

The fourth proportional to 656.81, 985.36 and 272.06 is: 408.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.81 : 985.36 = 272.06 : x
  2. Step 2: Convert to fraction form
    656.81/985.36 = 272.06/x
  3. Step 3: Cross multiply
    656.81x = 985.36 × 272.06
  4. Step 4: Simplify right side
    656.81x = 268,078.82
  5. Step 5: Solve for x
    x = 268,078.82/656.81
  6. Step 6: Final answer
    x = 408.15

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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.