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Finding the Fourth Proportional to 115,391.60, 172,703.40 and 83,711.60

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Solution

The fourth proportional to 115,391.60, 172,703.40 and 83,711.60 is: 125,288.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,391.60 : 172,703.40 = 83,711.60 : x
  2. Step 2: Convert to fraction form
    115,391.60/172,703.40 = 83,711.60/x
  3. Step 3: Cross multiply
    115,391.60x = 172,703.40 × 83,711.60
  4. Step 4: Simplify right side
    115,391.60x = 14,457,277,939.44
  5. Step 5: Solve for x
    x = 14,457,277,939.44/115,391.60
  6. Step 6: Final answer
    x = 125,288.82

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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.