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Finding the Fourth Proportional to 420,087.56, 630,122.70 and 139,607.56

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Solution

The fourth proportional to 420,087.56, 630,122.70 and 139,607.56 is: 209,408.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,087.56 : 630,122.70 = 139,607.56 : x
  2. Step 2: Convert to fraction form
    420,087.56/630,122.70 = 139,607.56/x
  3. Step 3: Cross multiply
    420,087.56x = 630,122.70 × 139,607.56
  4. Step 4: Simplify right side
    420,087.56x = 87,969,892,647.61
  5. Step 5: Solve for x
    x = 87,969,892,647.61/420,087.56
  6. Step 6: Final answer
    x = 209,408.47

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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.