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Finding the Fourth Proportional to 92,968.50, 128,634.30 and 81,056.64

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Solution

The fourth proportional to 92,968.50, 128,634.30 and 81,056.64 is: 112,152.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,968.50 : 128,634.30 = 81,056.64 : x
  2. Step 2: Convert to fraction form
    92,968.50/128,634.30 = 81,056.64/x
  3. Step 3: Cross multiply
    92,968.50x = 128,634.30 × 81,056.64
  4. Step 4: Simplify right side
    92,968.50x = 10,426,664,146.75
  5. Step 5: Solve for x
    x = 10,426,664,146.75/92,968.50
  6. Step 6: Final answer
    x = 112,152.66

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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.