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Finding the Fourth Proportional to 219,820.99, 329,509.95 and 86,649.70

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Solution

The fourth proportional to 219,820.99, 329,509.95 and 86,649.70 is: 129,887.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,820.99 : 329,509.95 = 86,649.70 : x
  2. Step 2: Convert to fraction form
    219,820.99/329,509.95 = 86,649.70/x
  3. Step 3: Cross multiply
    219,820.99x = 329,509.95 × 86,649.70
  4. Step 4: Simplify right side
    219,820.99x = 28,551,938,314.52
  5. Step 5: Solve for x
    x = 28,551,938,314.52/219,820.99
  6. Step 6: Final answer
    x = 129,887.22

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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.