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Finding the Fourth Proportional to 118,638, 163,715.64 and 70,917.72

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Solution

The fourth proportional to 118,638, 163,715.64 and 70,917.72 is: 97,863.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,638 : 163,715.64 = 70,917.72 : x
  2. Step 2: Convert to fraction form
    118,638/163,715.64 = 70,917.72/x
  3. Step 3: Cross multiply
    118,638x = 163,715.64 × 70,917.72
  4. Step 4: Simplify right side
    118,638x = 11,610,339,917.14
  5. Step 5: Solve for x
    x = 11,610,339,917.14/118,638
  6. Step 6: Final answer
    x = 97,863.58

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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.