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Finding the Fourth Proportional to 621.01, 931.06 and 312.71

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Solution

The fourth proportional to 621.01, 931.06 and 312.71 is: 468.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.01 : 931.06 = 312.71 : x
  2. Step 2: Convert to fraction form
    621.01/931.06 = 312.71/x
  3. Step 3: Cross multiply
    621.01x = 931.06 × 312.71
  4. Step 4: Simplify right side
    621.01x = 291,151.77
  5. Step 5: Solve for x
    x = 291,151.77/621.01
  6. Step 6: Final answer
    x = 468.84

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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.