Home / 420,204.20-630,311.76-139,721.45

Finding the Fourth Proportional to 420,204.20, 630,311.76 and 139,721.45

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Solution

The fourth proportional to 420,204.20, 630,311.76 and 139,721.45 is: 209,583.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,204.20 : 630,311.76 = 139,721.45 : x
  2. Step 2: Convert to fraction form
    420,204.20/630,311.76 = 139,721.45/x
  3. Step 3: Cross multiply
    420,204.20x = 630,311.76 × 139,721.45
  4. Step 4: Simplify right side
    420,204.20x = 88,068,069,907.69
  5. Step 5: Solve for x
    x = 88,068,069,907.69/420,204.20
  6. Step 6: Final answer
    x = 209,583.99

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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.