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Finding the Fourth Proportional to 621.58, 931.81 and 256.14

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Solution

The fourth proportional to 621.58, 931.81 and 256.14 is: 383.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.58 : 931.81 = 256.14 : x
  2. Step 2: Convert to fraction form
    621.58/931.81 = 256.14/x
  3. Step 3: Cross multiply
    621.58x = 931.81 × 256.14
  4. Step 4: Simplify right side
    621.58x = 238,673.81
  5. Step 5: Solve for x
    x = 238,673.81/621.58
  6. Step 6: Final answer
    x = 383.98

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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.