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Finding the Fourth Proportional to 420,127.20, 630,190.80 and 420,127.20

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Solution

The fourth proportional to 420,127.20, 630,190.80 and 420,127.20 is: 630,190.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,127.20 : 630,190.80 = 420,127.20 : x
  2. Step 2: Convert to fraction form
    420,127.20/630,190.80 = 420,127.20/x
  3. Step 3: Cross multiply
    420,127.20x = 630,190.80 × 420,127.20
  4. Step 4: Simplify right side
    420,127.20x = 264,760,296,269.76
  5. Step 5: Solve for x
    x = 264,760,296,269.76/420,127.20
  6. Step 6: Final answer
    x = 630,190.80

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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.