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Finding the Fourth Proportional to 647.55, 892.76 and 426.15

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Solution

The fourth proportional to 647.55, 892.76 and 426.15 is: 587.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.55 : 892.76 = 426.15 : x
  2. Step 2: Convert to fraction form
    647.55/892.76 = 426.15/x
  3. Step 3: Cross multiply
    647.55x = 892.76 × 426.15
  4. Step 4: Simplify right side
    647.55x = 380,447.54
  5. Step 5: Solve for x
    x = 380,447.54/647.55
  6. Step 6: Final answer
    x = 587.52

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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.