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Finding the Fourth Proportional to 420,156.40, 630,234.60 and 139,637.20

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Solution

The fourth proportional to 420,156.40, 630,234.60 and 139,637.20 is: 209,455.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,156.40 : 630,234.60 = 139,637.20 : x
  2. Step 2: Convert to fraction form
    420,156.40/630,234.60 = 139,637.20/x
  3. Step 3: Cross multiply
    420,156.40x = 630,234.60 × 139,637.20
  4. Step 4: Simplify right side
    420,156.40x = 88,004,194,887.12
  5. Step 5: Solve for x
    x = 88,004,194,887.12/420,156.40
  6. Step 6: Final answer
    x = 209,455.80

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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.