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Finding the Fourth Proportional to 121,112.60, 181,668.90 and 65,125.40

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Solution

The fourth proportional to 121,112.60, 181,668.90 and 65,125.40 is: 97,688.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,112.60 : 181,668.90 = 65,125.40 : x
  2. Step 2: Convert to fraction form
    121,112.60/181,668.90 = 65,125.40/x
  3. Step 3: Cross multiply
    121,112.60x = 181,668.90 × 65,125.40
  4. Step 4: Simplify right side
    121,112.60x = 11,831,259,780.06
  5. Step 5: Solve for x
    x = 11,831,259,780.06/121,112.60
  6. Step 6: Final answer
    x = 97,688.10

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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.