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Finding the Fourth Proportional to 153,920.40, 230,355.45 and 128,988.60

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Solution

The fourth proportional to 153,920.40, 230,355.45 and 128,988.60 is: 193,042.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,920.40 : 230,355.45 = 128,988.60 : x
  2. Step 2: Convert to fraction form
    153,920.40/230,355.45 = 128,988.60/x
  3. Step 3: Cross multiply
    153,920.40x = 230,355.45 × 128,988.60
  4. Step 4: Simplify right side
    153,920.40x = 29,713,226,997.87
  5. Step 5: Solve for x
    x = 29,713,226,997.87/153,920.40
  6. Step 6: Final answer
    x = 193,042.81

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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.