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Finding the Fourth Proportional to 621.50, 931.95 and 231.39

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Solution

The fourth proportional to 621.50, 931.95 and 231.39 is: 346.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.50 : 931.95 = 231.39 : x
  2. Step 2: Convert to fraction form
    621.50/931.95 = 231.39/x
  3. Step 3: Cross multiply
    621.50x = 931.95 × 231.39
  4. Step 4: Simplify right side
    621.50x = 215,643.91
  5. Step 5: Solve for x
    x = 215,643.91/621.50
  6. Step 6: Final answer
    x = 346.98

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Double scale
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Similar ratio
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1.5x scale

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.