Home / 128,384.10-192,211.65-121,401.90

Finding the Fourth Proportional to 128,384.10, 192,211.65 and 121,401.90

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Solution

The fourth proportional to 128,384.10, 192,211.65 and 121,401.90 is: 181,758.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,384.10 : 192,211.65 = 121,401.90 : x
  2. Step 2: Convert to fraction form
    128,384.10/192,211.65 = 121,401.90/x
  3. Step 3: Cross multiply
    128,384.10x = 192,211.65 × 121,401.90
  4. Step 4: Simplify right side
    128,384.10x = 23,334,859,512.14
  5. Step 5: Solve for x
    x = 23,334,859,512.14/128,384.10
  6. Step 6: Final answer
    x = 181,758.17

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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.