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Finding the Fourth Proportional to 78,391.73, 118,110.57 and 70,903.91

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Solution

The fourth proportional to 78,391.73, 118,110.57 and 70,903.91 is: 106,828.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,391.73 : 118,110.57 = 70,903.91 : x
  2. Step 2: Convert to fraction form
    78,391.73/118,110.57 = 70,903.91/x
  3. Step 3: Cross multiply
    78,391.73x = 118,110.57 × 70,903.91
  4. Step 4: Simplify right side
    78,391.73x = 8,374,500,634.78
  5. Step 5: Solve for x
    x = 8,374,500,634.78/78,391.73
  6. Step 6: Final answer
    x = 106,828.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.