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Finding the Fourth Proportional to 421,072.32, 631,620 and 140,579.52

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Solution

The fourth proportional to 421,072.32, 631,620 and 140,579.52 is: 210,873.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,072.32 : 631,620 = 140,579.52 : x
  2. Step 2: Convert to fraction form
    421,072.32/631,620 = 140,579.52/x
  3. Step 3: Cross multiply
    421,072.32x = 631,620 × 140,579.52
  4. Step 4: Simplify right side
    421,072.32x = 88,792,836,422.40
  5. Step 5: Solve for x
    x = 88,792,836,422.40/421,072.32
  6. Step 6: Final answer
    x = 210,873.13

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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.