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Finding the Fourth Proportional to 621.32, 931.90 and 188.51

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Solution

The fourth proportional to 621.32, 931.90 and 188.51 is: 282.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.32 : 931.90 = 188.51 : x
  2. Step 2: Convert to fraction form
    621.32/931.90 = 188.51/x
  3. Step 3: Cross multiply
    621.32x = 931.90 × 188.51
  4. Step 4: Simplify right side
    621.32x = 175,672.47
  5. Step 5: Solve for x
    x = 175,672.47/621.32
  6. Step 6: Final answer
    x = 282.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.