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Finding the Fourth Proportional to 128,521.44, 177,360.48 and 74,837.76

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Solution

The fourth proportional to 128,521.44, 177,360.48 and 74,837.76 is: 103,276.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,521.44 : 177,360.48 = 74,837.76 : x
  2. Step 2: Convert to fraction form
    128,521.44/177,360.48 = 74,837.76/x
  3. Step 3: Cross multiply
    128,521.44x = 177,360.48 × 74,837.76
  4. Step 4: Simplify right side
    128,521.44x = 13,273,261,035.72
  5. Step 5: Solve for x
    x = 13,273,261,035.72/128,521.44
  6. Step 6: Final answer
    x = 103,276.63

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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.