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Finding the Fourth Proportional to 631.10, 872.70 and 621.38

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Solution

The fourth proportional to 631.10, 872.70 and 621.38 is: 859.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.10 : 872.70 = 621.38 : x
  2. Step 2: Convert to fraction form
    631.10/872.70 = 621.38/x
  3. Step 3: Cross multiply
    631.10x = 872.70 × 621.38
  4. Step 4: Simplify right side
    631.10x = 542,278.33
  5. Step 5: Solve for x
    x = 542,278.33/631.10
  6. Step 6: Final answer
    x = 859.26

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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.