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Finding the Fourth Proportional to 420,007.20, 630,010.80 and 220,250.40

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Solution

The fourth proportional to 420,007.20, 630,010.80 and 220,250.40 is: 330,375.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,007.20 : 630,010.80 = 220,250.40 : x
  2. Step 2: Convert to fraction form
    420,007.20/630,010.80 = 220,250.40/x
  3. Step 3: Cross multiply
    420,007.20x = 630,010.80 × 220,250.40
  4. Step 4: Simplify right side
    420,007.20x = 138,760,130,704.32
  5. Step 5: Solve for x
    x = 138,760,130,704.32/420,007.20
  6. Step 6: Final answer
    x = 330,375.60

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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.