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Finding the Fourth Proportional to 128,589.90, 177,289.58 and 88,233.60

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Solution

The fourth proportional to 128,589.90, 177,289.58 and 88,233.60 is: 121,649.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,589.90 : 177,289.58 = 88,233.60 : x
  2. Step 2: Convert to fraction form
    128,589.90/177,289.58 = 88,233.60/x
  3. Step 3: Cross multiply
    128,589.90x = 177,289.58 × 88,233.60
  4. Step 4: Simplify right side
    128,589.90x = 15,642,898,274.99
  5. Step 5: Solve for x
    x = 15,642,898,274.99/128,589.90
  6. Step 6: Final answer
    x = 121,649.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.