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Finding the Fourth Proportional to 219,811.40, 329,652.30 and 86,647.40

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Solution

The fourth proportional to 219,811.40, 329,652.30 and 86,647.40 is: 129,945.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,811.40 : 329,652.30 = 86,647.40 : x
  2. Step 2: Convert to fraction form
    219,811.40/329,652.30 = 86,647.40/x
  3. Step 3: Cross multiply
    219,811.40x = 329,652.30 × 86,647.40
  4. Step 4: Simplify right side
    219,811.40x = 28,563,514,699.02
  5. Step 5: Solve for x
    x = 28,563,514,699.02/219,811.40
  6. Step 6: Final answer
    x = 129,945.56

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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.