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Finding the Fourth Proportional to 92,959.40, 139,730.70 and 91,209.80

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Solution

The fourth proportional to 92,959.40, 139,730.70 and 91,209.80 is: 137,100.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,959.40 : 139,730.70 = 91,209.80 : x
  2. Step 2: Convert to fraction form
    92,959.40/139,730.70 = 91,209.80/x
  3. Step 3: Cross multiply
    92,959.40x = 139,730.70 × 91,209.80
  4. Step 4: Simplify right side
    92,959.40x = 12,744,809,200.86
  5. Step 5: Solve for x
    x = 12,744,809,200.86/92,959.40
  6. Step 6: Final answer
    x = 137,100.81

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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.