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Finding the Fourth Proportional to 7,112.94, 9,815.80 and 3,926.24

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Solution

The fourth proportional to 7,112.94, 9,815.80 and 3,926.24 is: 5,418.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,112.94 : 9,815.80 = 3,926.24 : x
  2. Step 2: Convert to fraction form
    7,112.94/9,815.80 = 3,926.24/x
  3. Step 3: Cross multiply
    7,112.94x = 9,815.80 × 3,926.24
  4. Step 4: Simplify right side
    7,112.94x = 38,539,156.99
  5. Step 5: Solve for x
    x = 38,539,156.99/7,112.94
  6. Step 6: Final answer
    x = 5,418.18

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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.