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Finding the Fourth Proportional to 139,415.28, 192,392.76 and 78,985.80

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Solution

The fourth proportional to 139,415.28, 192,392.76 and 78,985.80 is: 109,000.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,415.28 : 192,392.76 = 78,985.80 : x
  2. Step 2: Convert to fraction form
    139,415.28/192,392.76 = 78,985.80/x
  3. Step 3: Cross multiply
    139,415.28x = 192,392.76 × 78,985.80
  4. Step 4: Simplify right side
    139,415.28x = 15,196,296,062.81
  5. Step 5: Solve for x
    x = 15,196,296,062.81/139,415.28
  6. Step 6: Final answer
    x = 109,000.22

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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.