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Finding the Fourth Proportional to 219,872, 329,586.48 and 86,700.64

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Solution

The fourth proportional to 219,872, 329,586.48 and 86,700.64 is: 129,963.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,872 : 329,586.48 = 86,700.64 : x
  2. Step 2: Convert to fraction form
    219,872/329,586.48 = 86,700.64/x
  3. Step 3: Cross multiply
    219,872x = 329,586.48 × 86,700.64
  4. Step 4: Simplify right side
    219,872x = 28,575,358,751.35
  5. Step 5: Solve for x
    x = 28,575,358,751.35/219,872
  6. Step 6: Final answer
    x = 129,963.61

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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.