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Finding the Fourth Proportional to 78,129, 117,193.53 and 21,975.07

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Solution

The fourth proportional to 78,129, 117,193.53 and 21,975.07 is: 32,962.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,129 : 117,193.53 = 21,975.07 : x
  2. Step 2: Convert to fraction form
    78,129/117,193.53 = 21,975.07/x
  3. Step 3: Cross multiply
    78,129x = 117,193.53 × 21,975.07
  4. Step 4: Simplify right side
    78,129x = 2,575,336,025.30
  5. Step 5: Solve for x
    x = 2,575,336,025.30/78,129
  6. Step 6: Final answer
    x = 32,962.61

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Double scale
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Similar ratio
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1.5x scale

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.