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Finding the Fourth Proportional to 621.15, 931.59 and 256.11

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Solution

The fourth proportional to 621.15, 931.59 and 256.11 is: 384.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.15 : 931.59 = 256.11 : x
  2. Step 2: Convert to fraction form
    621.15/931.59 = 256.11/x
  3. Step 3: Cross multiply
    621.15x = 931.59 × 256.11
  4. Step 4: Simplify right side
    621.15x = 238,589.51
  5. Step 5: Solve for x
    x = 238,589.51/621.15
  6. Step 6: Final answer
    x = 384.11

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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.