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Finding the Fourth Proportional to 128,589.60, 177,447.49 and 71,225.06

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Solution

The fourth proportional to 128,589.60, 177,447.49 and 71,225.06 is: 98,287.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,589.60 : 177,447.49 = 71,225.06 : x
  2. Step 2: Convert to fraction form
    128,589.60/177,447.49 = 71,225.06/x
  3. Step 3: Cross multiply
    128,589.60x = 177,447.49 × 71,225.06
  4. Step 4: Simplify right side
    128,589.60x = 12,638,707,056.80
  5. Step 5: Solve for x
    x = 12,638,707,056.80/128,589.60
  6. Step 6: Final answer
    x = 98,287.16

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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.