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Finding the Fourth Proportional to 128,589.36, 177,468.48 and 71,989.80

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Solution

The fourth proportional to 128,589.36, 177,468.48 and 71,989.80 is: 99,354.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,589.36 : 177,468.48 = 71,989.80 : x
  2. Step 2: Convert to fraction form
    128,589.36/177,468.48 = 71,989.80/x
  3. Step 3: Cross multiply
    128,589.36x = 177,468.48 × 71,989.80
  4. Step 4: Simplify right side
    128,589.36x = 12,775,920,381.50
  5. Step 5: Solve for x
    x = 12,775,920,381.50/128,589.36
  6. Step 6: Final answer
    x = 99,354.41

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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.