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Finding the Fourth Proportional to 154,212.96, 212,811.12 and 87,143.52

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Solution

The fourth proportional to 154,212.96, 212,811.12 and 87,143.52 is: 120,256.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,212.96 : 212,811.12 = 87,143.52 : x
  2. Step 2: Convert to fraction form
    154,212.96/212,811.12 = 87,143.52/x
  3. Step 3: Cross multiply
    154,212.96x = 212,811.12 × 87,143.52
  4. Step 4: Simplify right side
    154,212.96x = 18,545,110,091.94
  5. Step 5: Solve for x
    x = 18,545,110,091.94/154,212.96
  6. Step 6: Final answer
    x = 120,256.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.