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Finding the Fourth Proportional to 78,790.61, 118,012.16 and 65,126.61

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Solution

The fourth proportional to 78,790.61, 118,012.16 and 65,126.61 is: 97,546.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,790.61 : 118,012.16 = 65,126.61 : x
  2. Step 2: Convert to fraction form
    78,790.61/118,012.16 = 65,126.61/x
  3. Step 3: Cross multiply
    78,790.61x = 118,012.16 × 65,126.61
  4. Step 4: Simplify right side
    78,790.61x = 7,685,731,593.94
  5. Step 5: Solve for x
    x = 7,685,731,593.94/78,790.61
  6. Step 6: Final answer
    x = 97,546.29

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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.