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Finding the Fourth Proportional to 139,387.84, 192,341.34 and 78,946.42

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Solution

The fourth proportional to 139,387.84, 192,341.34 and 78,946.42 is: 108,938.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,387.84 : 192,341.34 = 78,946.42 : x
  2. Step 2: Convert to fraction form
    139,387.84/192,341.34 = 78,946.42/x
  3. Step 3: Cross multiply
    139,387.84x = 192,341.34 × 78,946.42
  4. Step 4: Simplify right side
    139,387.84x = 15,184,660,211.00
  5. Step 5: Solve for x
    x = 15,184,660,211.00/139,387.84
  6. Step 6: Final answer
    x = 108,938.20

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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.