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Finding the Fourth Proportional to 219,603.72, 329,609.70 and 86,575.80

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Solution

The fourth proportional to 219,603.72, 329,609.70 and 86,575.80 is: 129,944.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,603.72 : 329,609.70 = 86,575.80 : x
  2. Step 2: Convert to fraction form
    219,603.72/329,609.70 = 86,575.80/x
  3. Step 3: Cross multiply
    219,603.72x = 329,609.70 × 86,575.80
  4. Step 4: Simplify right side
    219,603.72x = 28,536,223,465.26
  5. Step 5: Solve for x
    x = 28,536,223,465.26/219,603.72
  6. Step 6: Final answer
    x = 129,944.17

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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.