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Finding the Fourth Proportional to 420,117.76, 630,540.60 and 220,579.12

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Solution

The fourth proportional to 420,117.76, 630,540.60 and 220,579.12 is: 331,059.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,117.76 : 630,540.60 = 220,579.12 : x
  2. Step 2: Convert to fraction form
    420,117.76/630,540.60 = 220,579.12/x
  3. Step 3: Cross multiply
    420,117.76x = 630,540.60 × 220,579.12
  4. Step 4: Simplify right side
    420,117.76x = 139,084,090,672.27
  5. Step 5: Solve for x
    x = 139,084,090,672.27/420,117.76
  6. Step 6: Final answer
    x = 331,059.77

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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.