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Finding the Fourth Proportional to 661.56, 913.40 and 440.96

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Solution

The fourth proportional to 661.56, 913.40 and 440.96 is: 608.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.56 : 913.40 = 440.96 : x
  2. Step 2: Convert to fraction form
    661.56/913.40 = 440.96/x
  3. Step 3: Cross multiply
    661.56x = 913.40 × 440.96
  4. Step 4: Simplify right side
    661.56x = 402,772.86
  5. Step 5: Solve for x
    x = 402,772.86/661.56
  6. Step 6: Final answer
    x = 608.82

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Double scale
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1.5x scale

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.