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Finding the Fourth Proportional to 221,085.55, 331,698.41 and 78,927.72

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Solution

The fourth proportional to 221,085.55, 331,698.41 and 78,927.72 is: 118,416.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,085.55 : 331,698.41 = 78,927.72 : x
  2. Step 2: Convert to fraction form
    221,085.55/331,698.41 = 78,927.72/x
  3. Step 3: Cross multiply
    221,085.55x = 331,698.41 × 78,927.72
  4. Step 4: Simplify right side
    221,085.55x = 26,180,197,886.40
  5. Step 5: Solve for x
    x = 26,180,197,886.40/221,085.55
  6. Step 6: Final answer
    x = 118,416.59

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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.