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Finding the Fourth Proportional to 421,339.80, 631,915.54 and 121,753.62

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Solution

The fourth proportional to 421,339.80, 631,915.54 and 121,753.62 is: 182,603.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,339.80 : 631,915.54 = 121,753.62 : x
  2. Step 2: Convert to fraction form
    421,339.80/631,915.54 = 121,753.62/x
  3. Step 3: Cross multiply
    421,339.80x = 631,915.54 × 121,753.62
  4. Step 4: Simplify right side
    421,339.80x = 76,938,004,529.25
  5. Step 5: Solve for x
    x = 76,938,004,529.25/421,339.80
  6. Step 6: Final answer
    x = 182,603.22

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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.