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Finding the Fourth Proportional to 133,128.59, 183,741.19 and 78,678.52

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Solution

The fourth proportional to 133,128.59, 183,741.19 and 78,678.52 is: 108,590.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    133,128.59 : 183,741.19 = 78,678.52 : x
  2. Step 2: Convert to fraction form
    133,128.59/183,741.19 = 78,678.52/x
  3. Step 3: Cross multiply
    133,128.59x = 183,741.19 × 78,678.52
  4. Step 4: Simplify right side
    133,128.59x = 14,456,484,236.19
  5. Step 5: Solve for x
    x = 14,456,484,236.19/133,128.59
  6. Step 6: Final answer
    x = 108,590.38

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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.