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Finding the Fourth Proportional to 280,721.79, 420,957.60 and 80,994.69

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Solution

The fourth proportional to 280,721.79, 420,957.60 and 80,994.69 is: 121,455.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,721.79 : 420,957.60 = 80,994.69 : x
  2. Step 2: Convert to fraction form
    280,721.79/420,957.60 = 80,994.69/x
  3. Step 3: Cross multiply
    280,721.79x = 420,957.60 × 80,994.69
  4. Step 4: Simplify right side
    280,721.79x = 34,095,330,315.14
  5. Step 5: Solve for x
    x = 34,095,330,315.14/280,721.79
  6. Step 6: Final answer
    x = 121,455.95

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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.