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Finding the Fourth Proportional to 420,991.36, 631,492.62 and 140,508.52

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Solution

The fourth proportional to 420,991.36, 631,492.62 and 140,508.52 is: 210,764.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,991.36 : 631,492.62 = 140,508.52 : x
  2. Step 2: Convert to fraction form
    420,991.36/631,492.62 = 140,508.52/x
  3. Step 3: Cross multiply
    420,991.36x = 631,492.62 × 140,508.52
  4. Step 4: Simplify right side
    420,991.36x = 88,730,093,427.12
  5. Step 5: Solve for x
    x = 88,730,093,427.12/420,991.36
  6. Step 6: Final answer
    x = 210,764.64

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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.