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Finding the Fourth Proportional to 420,636.60, 630,954.90 and 243,489.60

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Solution

The fourth proportional to 420,636.60, 630,954.90 and 243,489.60 is: 365,234.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,636.60 : 630,954.90 = 243,489.60 : x
  2. Step 2: Convert to fraction form
    420,636.60/630,954.90 = 243,489.60/x
  3. Step 3: Cross multiply
    420,636.60x = 630,954.90 × 243,489.60
  4. Step 4: Simplify right side
    420,636.60x = 153,630,956,219.04
  5. Step 5: Solve for x
    x = 153,630,956,219.04/420,636.60
  6. Step 6: Final answer
    x = 365,234.40

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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.