Home / 128,211.70-192,317.55-115,381.30

Finding the Fourth Proportional to 128,211.70, 192,317.55 and 115,381.30

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Solution

The fourth proportional to 128,211.70, 192,317.55 and 115,381.30 is: 173,071.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,211.70 : 192,317.55 = 115,381.30 : x
  2. Step 2: Convert to fraction form
    128,211.70/192,317.55 = 115,381.30/x
  3. Step 3: Cross multiply
    128,211.70x = 192,317.55 × 115,381.30
  4. Step 4: Simplify right side
    128,211.70x = 22,189,848,931.82
  5. Step 5: Solve for x
    x = 22,189,848,931.82/128,211.70
  6. Step 6: Final answer
    x = 173,071.95

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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.