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Finding the Fourth Proportional to 128,158.06, 192,127.62 and 90,599.98

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Solution

The fourth proportional to 128,158.06, 192,127.62 and 90,599.98 is: 135,822.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,158.06 : 192,127.62 = 90,599.98 : x
  2. Step 2: Convert to fraction form
    128,158.06/192,127.62 = 90,599.98/x
  3. Step 3: Cross multiply
    128,158.06x = 192,127.62 × 90,599.98
  4. Step 4: Simplify right side
    128,158.06x = 17,406,758,529.45
  5. Step 5: Solve for x
    x = 17,406,758,529.45/128,158.06
  6. Step 6: Final answer
    x = 135,822.58

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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.