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Finding the Fourth Proportional to 91,364, 136,308.94 and 81,391.28

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Solution

The fourth proportional to 91,364, 136,308.94 and 81,391.28 is: 121,430.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,364 : 136,308.94 = 81,391.28 : x
  2. Step 2: Convert to fraction form
    91,364/136,308.94 = 81,391.28/x
  3. Step 3: Cross multiply
    91,364x = 136,308.94 × 81,391.28
  4. Step 4: Simplify right side
    91,364x = 11,094,359,102.04
  5. Step 5: Solve for x
    x = 11,094,359,102.04/91,364
  6. Step 6: Final answer
    x = 121,430.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.