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Finding the Fourth Proportional to 661.56, 913.72 and 440.14

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Solution

The fourth proportional to 661.56, 913.72 and 440.14 is: 607.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.56 : 913.72 = 440.14 : x
  2. Step 2: Convert to fraction form
    661.56/913.72 = 440.14/x
  3. Step 3: Cross multiply
    661.56x = 913.72 × 440.14
  4. Step 4: Simplify right side
    661.56x = 402,164.72
  5. Step 5: Solve for x
    x = 402,164.72/661.56
  6. Step 6: Final answer
    x = 607.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.