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Finding the Fourth Proportional to 78,554.95, 117,830.83 and 19,391.13

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Solution

The fourth proportional to 78,554.95, 117,830.83 and 19,391.13 is: 29,086.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,554.95 : 117,830.83 = 19,391.13 : x
  2. Step 2: Convert to fraction form
    78,554.95/117,830.83 = 19,391.13/x
  3. Step 3: Cross multiply
    78,554.95x = 117,830.83 × 19,391.13
  4. Step 4: Simplify right side
    78,554.95x = 2,284,873,151.35
  5. Step 5: Solve for x
    x = 2,284,873,151.35/78,554.95
  6. Step 6: Final answer
    x = 29,086.30

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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.