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Finding the Fourth Proportional to 621.35, 931.38 and 291.95

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Solution

The fourth proportional to 621.35, 931.38 and 291.95 is: 437.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.35 : 931.38 = 291.95 : x
  2. Step 2: Convert to fraction form
    621.35/931.38 = 291.95/x
  3. Step 3: Cross multiply
    621.35x = 931.38 × 291.95
  4. Step 4: Simplify right side
    621.35x = 271,916.39
  5. Step 5: Solve for x
    x = 271,916.39/621.35
  6. Step 6: Final answer
    x = 437.62

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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.