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Finding the Fourth Proportional to 630.99, 870.66 and 351.23

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Solution

The fourth proportional to 630.99, 870.66 and 351.23 is: 484.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.99 : 870.66 = 351.23 : x
  2. Step 2: Convert to fraction form
    630.99/870.66 = 351.23/x
  3. Step 3: Cross multiply
    630.99x = 870.66 × 351.23
  4. Step 4: Simplify right side
    630.99x = 305,798.44
  5. Step 5: Solve for x
    x = 305,798.44/630.99
  6. Step 6: Final answer
    x = 484.64

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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.