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Finding the Fourth Proportional to 128,629.60, 193,010.25 and 61,237.87

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Solution

The fourth proportional to 128,629.60, 193,010.25 and 61,237.87 is: 91,888.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,629.60 : 193,010.25 = 61,237.87 : x
  2. Step 2: Convert to fraction form
    128,629.60/193,010.25 = 61,237.87/x
  3. Step 3: Cross multiply
    128,629.60x = 193,010.25 × 61,237.87
  4. Step 4: Simplify right side
    128,629.60x = 11,819,536,598.17
  5. Step 5: Solve for x
    x = 11,819,536,598.17/128,629.60
  6. Step 6: Final answer
    x = 91,888.15

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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.