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Finding the Fourth Proportional to 485.64, 731.36 and 425.50

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Solution

The fourth proportional to 485.64, 731.36 and 425.50 is: 640.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.64 : 731.36 = 425.50 : x
  2. Step 2: Convert to fraction form
    485.64/731.36 = 425.50/x
  3. Step 3: Cross multiply
    485.64x = 731.36 × 425.50
  4. Step 4: Simplify right side
    485.64x = 311,192.92
  5. Step 5: Solve for x
    x = 311,192.92/485.64
  6. Step 6: Final answer
    x = 640.79

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.