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Finding the Fourth Proportional to 84,615.39, 126,929.46 and 28,455.66

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Solution

The fourth proportional to 84,615.39, 126,929.46 and 28,455.66 is: 42,685.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,615.39 : 126,929.46 = 28,455.66 : x
  2. Step 2: Convert to fraction form
    84,615.39/126,929.46 = 28,455.66/x
  3. Step 3: Cross multiply
    84,615.39x = 126,929.46 × 28,455.66
  4. Step 4: Simplify right side
    84,615.39x = 3,611,861,557.74
  5. Step 5: Solve for x
    x = 3,611,861,557.74/84,615.39
  6. Step 6: Final answer
    x = 42,685.63

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1.5x scale

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.