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Finding the Fourth Proportional to 78,876.84, 118,315.56 and 19,712.57

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Solution

The fourth proportional to 78,876.84, 118,315.56 and 19,712.57 is: 29,568.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,876.84 : 118,315.56 = 19,712.57 : x
  2. Step 2: Convert to fraction form
    78,876.84/118,315.56 = 19,712.57/x
  3. Step 3: Cross multiply
    78,876.84x = 118,315.56 × 19,712.57
  4. Step 4: Simplify right side
    78,876.84x = 2,332,303,758.59
  5. Step 5: Solve for x
    x = 2,332,303,758.59/78,876.84
  6. Step 6: Final answer
    x = 29,568.93

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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.