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Finding the Fourth Proportional to 621.07, 931.02 and 312.56

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Solution

The fourth proportional to 621.07, 931.02 and 312.56 is: 468.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.07 : 931.02 = 312.56 : x
  2. Step 2: Convert to fraction form
    621.07/931.02 = 312.56/x
  3. Step 3: Cross multiply
    621.07x = 931.02 × 312.56
  4. Step 4: Simplify right side
    621.07x = 290,999.61
  5. Step 5: Solve for x
    x = 290,999.61/621.07
  6. Step 6: Final answer
    x = 468.55

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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.