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Finding the Fourth Proportional to 420,228.60, 630,348.12 and 139,745.76

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Solution

The fourth proportional to 420,228.60, 630,348.12 and 139,745.76 is: 209,620.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,228.60 : 630,348.12 = 139,745.76 : x
  2. Step 2: Convert to fraction form
    420,228.60/630,348.12 = 139,745.76/x
  3. Step 3: Cross multiply
    420,228.60x = 630,348.12 × 139,745.76
  4. Step 4: Simplify right side
    420,228.60x = 88,088,477,093.97
  5. Step 5: Solve for x
    x = 88,088,477,093.97/420,228.60
  6. Step 6: Final answer
    x = 209,620.38

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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.