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Finding the Fourth Proportional to 420,001.60, 630,002.40 and 270,410.80

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Solution

The fourth proportional to 420,001.60, 630,002.40 and 270,410.80 is: 405,616.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,001.60 : 630,002.40 = 270,410.80 : x
  2. Step 2: Convert to fraction form
    420,001.60/630,002.40 = 270,410.80/x
  3. Step 3: Cross multiply
    420,001.60x = 630,002.40 × 270,410.80
  4. Step 4: Simplify right side
    420,001.60x = 170,359,452,985.92
  5. Step 5: Solve for x
    x = 170,359,452,985.92/420,001.60
  6. Step 6: Final answer
    x = 405,616.20

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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.