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Finding the Fourth Proportional to 128,913.18, 193,375.01 and 61,410.51

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Solution

The fourth proportional to 128,913.18, 193,375.01 and 61,410.51 is: 92,118.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,913.18 : 193,375.01 = 61,410.51 : x
  2. Step 2: Convert to fraction form
    128,913.18/193,375.01 = 61,410.51/x
  3. Step 3: Cross multiply
    128,913.18x = 193,375.01 × 61,410.51
  4. Step 4: Simplify right side
    128,913.18x = 11,875,257,985.36
  5. Step 5: Solve for x
    x = 11,875,257,985.36/128,913.18
  6. Step 6: Final answer
    x = 92,118.26

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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.