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Finding the Fourth Proportional to 621.17, 931.53 and 210.23

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Solution

The fourth proportional to 621.17, 931.53 and 210.23 is: 315.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.17 : 931.53 = 210.23 : x
  2. Step 2: Convert to fraction form
    621.17/931.53 = 210.23/x
  3. Step 3: Cross multiply
    621.17x = 931.53 × 210.23
  4. Step 4: Simplify right side
    621.17x = 195,835.55
  5. Step 5: Solve for x
    x = 195,835.55/621.17
  6. Step 6: Final answer
    x = 315.27

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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.