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Finding the Fourth Proportional to 139,400.88, 192,366.95 and 78,970.29

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Solution

The fourth proportional to 139,400.88, 192,366.95 and 78,970.29 is: 108,975.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,400.88 : 192,366.95 = 78,970.29 : x
  2. Step 2: Convert to fraction form
    139,400.88/192,366.95 = 78,970.29/x
  3. Step 3: Cross multiply
    139,400.88x = 192,366.95 × 78,970.29
  4. Step 4: Simplify right side
    139,400.88x = 15,191,273,433.06
  5. Step 5: Solve for x
    x = 15,191,273,433.06/139,400.88
  6. Step 6: Final answer
    x = 108,975.45

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1.5x scale

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.