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Finding the Fourth Proportional to 128,451.77, 192,696.12 and 39,712.20

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Solution

The fourth proportional to 128,451.77, 192,696.12 and 39,712.20 is: 59,574.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,451.77 : 192,696.12 = 39,712.20 : x
  2. Step 2: Convert to fraction form
    128,451.77/192,696.12 = 39,712.20/x
  3. Step 3: Cross multiply
    128,451.77x = 192,696.12 × 39,712.20
  4. Step 4: Simplify right side
    128,451.77x = 7,652,386,856.66
  5. Step 5: Solve for x
    x = 7,652,386,856.66/128,451.77
  6. Step 6: Final answer
    x = 59,574.01

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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.