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Finding the Fourth Proportional to 630.19, 869.66 and 354.19

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Solution

The fourth proportional to 630.19, 869.66 and 354.19 is: 488.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.19 : 869.66 = 354.19 : x
  2. Step 2: Convert to fraction form
    630.19/869.66 = 354.19/x
  3. Step 3: Cross multiply
    630.19x = 869.66 × 354.19
  4. Step 4: Simplify right side
    630.19x = 308,024.88
  5. Step 5: Solve for x
    x = 308,024.88/630.19
  6. Step 6: Final answer
    x = 488.78

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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.