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Finding the Fourth Proportional to 289,920.80, 434,859.60 and 121,397.60

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Solution

The fourth proportional to 289,920.80, 434,859.60 and 121,397.60 is: 182,087.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,920.80 : 434,859.60 = 121,397.60 : x
  2. Step 2: Convert to fraction form
    289,920.80/434,859.60 = 121,397.60/x
  3. Step 3: Cross multiply
    289,920.80x = 434,859.60 × 121,397.60
  4. Step 4: Simplify right side
    289,920.80x = 52,790,911,776.96
  5. Step 5: Solve for x
    x = 52,790,911,776.96/289,920.80
  6. Step 6: Final answer
    x = 182,087.36

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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.