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Finding the Fourth Proportional to 128,091, 192,165.72 and 44,985

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Solution

The fourth proportional to 128,091, 192,165.72 and 44,985 is: 67,487.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,091 : 192,165.72 = 44,985 : x
  2. Step 2: Convert to fraction form
    128,091/192,165.72 = 44,985/x
  3. Step 3: Cross multiply
    128,091x = 192,165.72 × 44,985
  4. Step 4: Simplify right side
    128,091x = 8,644,574,914.20
  5. Step 5: Solve for x
    x = 8,644,574,914.20/128,091
  6. Step 6: Final answer
    x = 67,487.76

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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.