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Finding the Fourth Proportional to 621,200.40, 931,800.60 and 420,433.80

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Solution

The fourth proportional to 621,200.40, 931,800.60 and 420,433.80 is: 630,650.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,200.40 : 931,800.60 = 420,433.80 : x
  2. Step 2: Convert to fraction form
    621,200.40/931,800.60 = 420,433.80/x
  3. Step 3: Cross multiply
    621,200.40x = 931,800.60 × 420,433.80
  4. Step 4: Simplify right side
    621,200.40x = 391,760,467,100.28
  5. Step 5: Solve for x
    x = 391,760,467,100.28/621,200.40
  6. Step 6: Final answer
    x = 630,650.70

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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.