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Finding the Fourth Proportional to 88,420.86, 121,984.71 and 54,419.09

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Solution

The fourth proportional to 88,420.86, 121,984.71 and 54,419.09 is: 75,076.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    88,420.86 : 121,984.71 = 54,419.09 : x
  2. Step 2: Convert to fraction form
    88,420.86/121,984.71 = 54,419.09/x
  3. Step 3: Cross multiply
    88,420.86x = 121,984.71 × 54,419.09
  4. Step 4: Simplify right side
    88,420.86x = 6,638,296,302.19
  5. Step 5: Solve for x
    x = 6,638,296,302.19/88,420.86
  6. Step 6: Final answer
    x = 75,076.13

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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.