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Finding the Fourth Proportional to 128,074.56, 192,111.84 and 65,705.28

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Solution

The fourth proportional to 128,074.56, 192,111.84 and 65,705.28 is: 98,557.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,074.56 : 192,111.84 = 65,705.28 : x
  2. Step 2: Convert to fraction form
    128,074.56/192,111.84 = 65,705.28/x
  3. Step 3: Cross multiply
    128,074.56x = 192,111.84 × 65,705.28
  4. Step 4: Simplify right side
    128,074.56x = 12,622,762,238.52
  5. Step 5: Solve for x
    x = 12,622,762,238.52/128,074.56
  6. Step 6: Final answer
    x = 98,557.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.