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Finding the Fourth Proportional to 630.20, 945.30 and 435.80

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Solution

The fourth proportional to 630.20, 945.30 and 435.80 is: 653.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.20 : 945.30 = 435.80 : x
  2. Step 2: Convert to fraction form
    630.20/945.30 = 435.80/x
  3. Step 3: Cross multiply
    630.20x = 945.30 × 435.80
  4. Step 4: Simplify right side
    630.20x = 411,961.74
  5. Step 5: Solve for x
    x = 411,961.74/630.20
  6. Step 6: Final answer
    x = 653.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.