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Finding the Fourth Proportional to 78,295.98, 117,443.97 and 19,131.57

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Solution

The fourth proportional to 78,295.98, 117,443.97 and 19,131.57 is: 28,697.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,295.98 : 117,443.97 = 19,131.57 : x
  2. Step 2: Convert to fraction form
    78,295.98/117,443.97 = 19,131.57/x
  3. Step 3: Cross multiply
    78,295.98x = 117,443.97 × 19,131.57
  4. Step 4: Simplify right side
    78,295.98x = 2,246,887,533.13
  5. Step 5: Solve for x
    x = 2,246,887,533.13/78,295.98
  6. Step 6: Final answer
    x = 28,697.36

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1.5x scale

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.