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Finding the Fourth Proportional to 421,258.66, 631,887.99 and 140,775.91

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Solution

The fourth proportional to 421,258.66, 631,887.99 and 140,775.91 is: 211,163.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,258.66 : 631,887.99 = 140,775.91 : x
  2. Step 2: Convert to fraction form
    421,258.66/631,887.99 = 140,775.91/x
  3. Step 3: Cross multiply
    421,258.66x = 631,887.99 × 140,775.91
  4. Step 4: Simplify right side
    421,258.66x = 88,954,606,810.32
  5. Step 5: Solve for x
    x = 88,954,606,810.32/421,258.66
  6. Step 6: Final answer
    x = 211,163.87

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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.