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Finding the Fourth Proportional to 78,839.70, 118,291.95 and 28,943.70

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Solution

The fourth proportional to 78,839.70, 118,291.95 and 28,943.70 is: 43,427.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,839.70 : 118,291.95 = 28,943.70 : x
  2. Step 2: Convert to fraction form
    78,839.70/118,291.95 = 28,943.70/x
  3. Step 3: Cross multiply
    78,839.70x = 118,291.95 × 28,943.70
  4. Step 4: Simplify right side
    78,839.70x = 3,423,806,713.22
  5. Step 5: Solve for x
    x = 3,423,806,713.22/78,839.70
  6. Step 6: Final answer
    x = 43,427.44

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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.