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Finding the Fourth Proportional to 91,383.70, 125,985.49 and 64,122.74

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Solution

The fourth proportional to 91,383.70, 125,985.49 and 64,122.74 is: 88,402.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,383.70 : 125,985.49 = 64,122.74 : x
  2. Step 2: Convert to fraction form
    91,383.70/125,985.49 = 64,122.74/x
  3. Step 3: Cross multiply
    91,383.70x = 125,985.49 × 64,122.74
  4. Step 4: Simplify right side
    91,383.70x = 8,078,534,973.70
  5. Step 5: Solve for x
    x = 8,078,534,973.70/91,383.70
  6. Step 6: Final answer
    x = 88,402.36

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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.