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Finding the Fourth Proportional to 129,483.88, 178,712.55 and 72,895.25

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Solution

The fourth proportional to 129,483.88, 178,712.55 and 72,895.25 is: 100,609.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,483.88 : 178,712.55 = 72,895.25 : x
  2. Step 2: Convert to fraction form
    129,483.88/178,712.55 = 72,895.25/x
  3. Step 3: Cross multiply
    129,483.88x = 178,712.55 × 72,895.25
  4. Step 4: Simplify right side
    129,483.88x = 13,027,296,457.17
  5. Step 5: Solve for x
    x = 13,027,296,457.17/129,483.88
  6. Step 6: Final answer
    x = 100,609.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.