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Finding the Fourth Proportional to 420,015.40, 630,023.10 and 120,469.30

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Solution

The fourth proportional to 420,015.40, 630,023.10 and 120,469.30 is: 180,703.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,015.40 : 630,023.10 = 120,469.30 : x
  2. Step 2: Convert to fraction form
    420,015.40/630,023.10 = 120,469.30/x
  3. Step 3: Cross multiply
    420,015.40x = 630,023.10 × 120,469.30
  4. Step 4: Simplify right side
    420,015.40x = 75,898,441,840.83
  5. Step 5: Solve for x
    x = 75,898,441,840.83/420,015.40
  6. Step 6: Final answer
    x = 180,703.95

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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.