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Finding the Fourth Proportional to 219,867.70, 329,558.55 and 86,703.70

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Solution

The fourth proportional to 219,867.70, 329,558.55 and 86,703.70 is: 129,959.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,867.70 : 329,558.55 = 86,703.70 : x
  2. Step 2: Convert to fraction form
    219,867.70/329,558.55 = 86,703.70/x
  3. Step 3: Cross multiply
    219,867.70x = 329,558.55 × 86,703.70
  4. Step 4: Simplify right side
    219,867.70x = 28,573,945,651.64
  5. Step 5: Solve for x
    x = 28,573,945,651.64/219,867.70
  6. Step 6: Final answer
    x = 129,959.72

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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.