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Finding the Fourth Proportional to 128,987.48, 193,476.18 and 35,490.68

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Solution

The fourth proportional to 128,987.48, 193,476.18 and 35,490.68 is: 53,234.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,987.48 : 193,476.18 = 35,490.68 : x
  2. Step 2: Convert to fraction form
    128,987.48/193,476.18 = 35,490.68/x
  3. Step 3: Cross multiply
    128,987.48x = 193,476.18 × 35,490.68
  4. Step 4: Simplify right side
    128,987.48x = 6,866,601,192.00
  5. Step 5: Solve for x
    x = 6,866,601,192.00/128,987.48
  6. Step 6: Final answer
    x = 53,234.63

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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.