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Finding the Fourth Proportional to 128,974.40, 193,461.60 and 119,643.20

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Solution

The fourth proportional to 128,974.40, 193,461.60 and 119,643.20 is: 179,464.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,974.40 : 193,461.60 = 119,643.20 : x
  2. Step 2: Convert to fraction form
    128,974.40/193,461.60 = 119,643.20/x
  3. Step 3: Cross multiply
    128,974.40x = 193,461.60 × 119,643.20
  4. Step 4: Simplify right side
    128,974.40x = 23,146,364,901.12
  5. Step 5: Solve for x
    x = 23,146,364,901.12/128,974.40
  6. Step 6: Final answer
    x = 179,464.80

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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.