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Finding the Fourth Proportional to 621.60, 931.78 and 552.75

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Solution

The fourth proportional to 621.60, 931.78 and 552.75 is: 828.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.60 : 931.78 = 552.75 : x
  2. Step 2: Convert to fraction form
    621.60/931.78 = 552.75/x
  3. Step 3: Cross multiply
    621.60x = 931.78 × 552.75
  4. Step 4: Simplify right side
    621.60x = 515,041.40
  5. Step 5: Solve for x
    x = 515,041.40/621.60
  6. Step 6: Final answer
    x = 828.57

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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.