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Finding the Fourth Proportional to 630.45, 863.21 and 630.45

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Solution

The fourth proportional to 630.45, 863.21 and 630.45 is: 863.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.45 : 863.21 = 630.45 : x
  2. Step 2: Convert to fraction form
    630.45/863.21 = 630.45/x
  3. Step 3: Cross multiply
    630.45x = 863.21 × 630.45
  4. Step 4: Simplify right side
    630.45x = 544,212.32
  5. Step 5: Solve for x
    x = 544,212.32/630.45
  6. Step 6: Final answer
    x = 863.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.