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Finding the Fourth Proportional to 128,706.12, 177,706.98 and 83,449.80

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Solution

The fourth proportional to 128,706.12, 177,706.98 and 83,449.80 is: 115,220.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,706.12 : 177,706.98 = 83,449.80 : x
  2. Step 2: Convert to fraction form
    128,706.12/177,706.98 = 83,449.80/x
  3. Step 3: Cross multiply
    128,706.12x = 177,706.98 × 83,449.80
  4. Step 4: Simplify right side
    128,706.12x = 14,829,611,939.60
  5. Step 5: Solve for x
    x = 14,829,611,939.60/128,706.12
  6. Step 6: Final answer
    x = 115,220.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.