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Finding the Fourth Proportional to 631.95, 872.34 and 445.53

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Solution

The fourth proportional to 631.95, 872.34 and 445.53 is: 615.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.95 : 872.34 = 445.53 : x
  2. Step 2: Convert to fraction form
    631.95/872.34 = 445.53/x
  3. Step 3: Cross multiply
    631.95x = 872.34 × 445.53
  4. Step 4: Simplify right side
    631.95x = 388,653.64
  5. Step 5: Solve for x
    x = 388,653.64/631.95
  6. Step 6: Final answer
    x = 615.01

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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.