Home / 139,218.95-192,122.08-78,788.50

Finding the Fourth Proportional to 139,218.95, 192,122.08 and 78,788.50

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Solution

The fourth proportional to 139,218.95, 192,122.08 and 78,788.50 is: 108,728.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,218.95 : 192,122.08 = 78,788.50 : x
  2. Step 2: Convert to fraction form
    139,218.95/192,122.08 = 78,788.50/x
  3. Step 3: Cross multiply
    139,218.95x = 192,122.08 × 78,788.50
  4. Step 4: Simplify right side
    139,218.95x = 15,137,009,822.80
  5. Step 5: Solve for x
    x = 15,137,009,822.80/139,218.95
  6. Step 6: Final answer
    x = 108,728.08

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.