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Finding the Fourth Proportional to 84,615.89, 126,930.21 and 28,456.16

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Solution

The fourth proportional to 84,615.89, 126,930.21 and 28,456.16 is: 42,686.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,615.89 : 126,930.21 = 28,456.16 : x
  2. Step 2: Convert to fraction form
    84,615.89/126,930.21 = 28,456.16/x
  3. Step 3: Cross multiply
    84,615.89x = 126,930.21 × 28,456.16
  4. Step 4: Simplify right side
    84,615.89x = 3,611,946,364.59
  5. Step 5: Solve for x
    x = 3,611,946,364.59/84,615.89
  6. Step 6: Final answer
    x = 42,686.38

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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.