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Finding the Fourth Proportional to 420,326.31, 630,494.97 and 139,843.56

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Solution

The fourth proportional to 420,326.31, 630,494.97 and 139,843.56 is: 209,767.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,326.31 : 630,494.97 = 139,843.56 : x
  2. Step 2: Convert to fraction form
    420,326.31/630,494.97 = 139,843.56/x
  3. Step 3: Cross multiply
    420,326.31x = 630,494.97 × 139,843.56
  4. Step 4: Simplify right side
    420,326.31x = 88,170,661,166.89
  5. Step 5: Solve for x
    x = 88,170,661,166.89/420,326.31
  6. Step 6: Final answer
    x = 209,767.17

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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.