Home / 420,200.63-630,306.43-139,717.88

Finding the Fourth Proportional to 420,200.63, 630,306.43 and 139,717.88

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Solution

The fourth proportional to 420,200.63, 630,306.43 and 139,717.88 is: 209,578.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,200.63 : 630,306.43 = 139,717.88 : x
  2. Step 2: Convert to fraction form
    420,200.63/630,306.43 = 139,717.88/x
  3. Step 3: Cross multiply
    420,200.63x = 630,306.43 × 139,717.88
  4. Step 4: Simplify right side
    420,200.63x = 88,065,078,149.97
  5. Step 5: Solve for x
    x = 88,065,078,149.97/420,200.63
  6. Step 6: Final answer
    x = 209,578.64

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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.