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Finding the Fourth Proportional to 128,908.52, 193,368.03 and 61,405.86

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Solution

The fourth proportional to 128,908.52, 193,368.03 and 61,405.86 is: 92,111.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,908.52 : 193,368.03 = 61,405.86 : x
  2. Step 2: Convert to fraction form
    128,908.52/193,368.03 = 61,405.86/x
  3. Step 3: Cross multiply
    128,908.52x = 193,368.03 × 61,405.86
  4. Step 4: Simplify right side
    128,908.52x = 11,873,929,223.25
  5. Step 5: Solve for x
    x = 11,873,929,223.25/128,908.52
  6. Step 6: Final answer
    x = 92,111.28

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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.