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Finding the Fourth Proportional to 7,800.95, 11,743.55 and 7,122.98

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Solution

The fourth proportional to 7,800.95, 11,743.55 and 7,122.98 is: 10,722.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,800.95 : 11,743.55 = 7,122.98 : x
  2. Step 2: Convert to fraction form
    7,800.95/11,743.55 = 7,122.98/x
  3. Step 3: Cross multiply
    7,800.95x = 11,743.55 × 7,122.98
  4. Step 4: Simplify right side
    7,800.95x = 83,648,977.45
  5. Step 5: Solve for x
    x = 83,648,977.45/7,800.95
  6. Step 6: Final answer
    x = 10,722.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.