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Finding the Fourth Proportional to 115,959.61, 173,739.71 and 90,649.28

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Solution

The fourth proportional to 115,959.61, 173,739.71 and 90,649.28 is: 135,817.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,959.61 : 173,739.71 = 90,649.28 : x
  2. Step 2: Convert to fraction form
    115,959.61/173,739.71 = 90,649.28/x
  3. Step 3: Cross multiply
    115,959.61x = 173,739.71 × 90,649.28
  4. Step 4: Simplify right side
    115,959.61x = 15,749,379,618.91
  5. Step 5: Solve for x
    x = 15,749,379,618.91/115,959.61
  6. Step 6: Final answer
    x = 135,817.80

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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.