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Finding the Fourth Proportional to 112,215, 154,856.70 and 61,914

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Solution

The fourth proportional to 112,215, 154,856.70 and 61,914 is: 85,441.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,215 : 154,856.70 = 61,914 : x
  2. Step 2: Convert to fraction form
    112,215/154,856.70 = 61,914/x
  3. Step 3: Cross multiply
    112,215x = 154,856.70 × 61,914
  4. Step 4: Simplify right side
    112,215x = 9,587,797,955.98
  5. Step 5: Solve for x
    x = 9,587,797,955.98/112,215
  6. Step 6: Final answer
    x = 85,441.32

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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.