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Finding the Fourth Proportional to 118,710.63, 177,999.39 and 81,312.93

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Solution

The fourth proportional to 118,710.63, 177,999.39 and 81,312.93 is: 121,923.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,710.63 : 177,999.39 = 81,312.93 : x
  2. Step 2: Convert to fraction form
    118,710.63/177,999.39 = 81,312.93/x
  3. Step 3: Cross multiply
    118,710.63x = 177,999.39 × 81,312.93
  4. Step 4: Simplify right side
    118,710.63x = 14,473,651,939.11
  5. Step 5: Solve for x
    x = 14,473,651,939.11/118,710.63
  6. Step 6: Final answer
    x = 121,923.81

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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.