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Finding the Fourth Proportional to 128,897.08, 193,422.17 and 69,731.44

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Solution

The fourth proportional to 128,897.08, 193,422.17 and 69,731.44 is: 104,638.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,897.08 : 193,422.17 = 69,731.44 : x
  2. Step 2: Convert to fraction form
    128,897.08/193,422.17 = 69,731.44/x
  3. Step 3: Cross multiply
    128,897.08x = 193,422.17 × 69,731.44
  4. Step 4: Simplify right side
    128,897.08x = 13,487,606,442.02
  5. Step 5: Solve for x
    x = 13,487,606,442.02/128,897.08
  6. Step 6: Final answer
    x = 104,638.57

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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.