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Finding the Fourth Proportional to 128,896.95, 177,837.90 and 75,143.91

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Solution

The fourth proportional to 128,896.95, 177,837.90 and 75,143.91 is: 103,675.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,896.95 : 177,837.90 = 75,143.91 : x
  2. Step 2: Convert to fraction form
    128,896.95/177,837.90 = 75,143.91/x
  3. Step 3: Cross multiply
    128,896.95x = 177,837.90 × 75,143.91
  4. Step 4: Simplify right side
    128,896.95x = 13,363,435,152.19
  5. Step 5: Solve for x
    x = 13,363,435,152.19/128,896.95
  6. Step 6: Final answer
    x = 103,675.34

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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.