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Finding the Fourth Proportional to 631.99, 872.13 and 613.36

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Solution

The fourth proportional to 631.99, 872.13 and 613.36 is: 846.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.99 : 872.13 = 613.36 : x
  2. Step 2: Convert to fraction form
    631.99/872.13 = 613.36/x
  3. Step 3: Cross multiply
    631.99x = 872.13 × 613.36
  4. Step 4: Simplify right side
    631.99x = 534,929.66
  5. Step 5: Solve for x
    x = 534,929.66/631.99
  6. Step 6: Final answer
    x = 846.42

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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.