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Finding the Fourth Proportional to 128,611.60, 177,440.83 and 74,885.11

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Solution

The fourth proportional to 128,611.60, 177,440.83 and 74,885.11 is: 103,316.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,611.60 : 177,440.83 = 74,885.11 : x
  2. Step 2: Convert to fraction form
    128,611.60/177,440.83 = 74,885.11/x
  3. Step 3: Cross multiply
    128,611.60x = 177,440.83 × 74,885.11
  4. Step 4: Simplify right side
    128,611.60x = 13,287,676,073.04
  5. Step 5: Solve for x
    x = 13,287,676,073.04/128,611.60
  6. Step 6: Final answer
    x = 103,316.31

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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.