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Finding the Fourth Proportional to 621.06, 930.30 and 425.40

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Solution

The fourth proportional to 621.06, 930.30 and 425.40 is: 637.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.06 : 930.30 = 425.40 : x
  2. Step 2: Convert to fraction form
    621.06/930.30 = 425.40/x
  3. Step 3: Cross multiply
    621.06x = 930.30 × 425.40
  4. Step 4: Simplify right side
    621.06x = 395,749.62
  5. Step 5: Solve for x
    x = 395,749.62/621.06
  6. Step 6: Final answer
    x = 637.22

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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.