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Finding the Fourth Proportional to 20,618.95, 30,928.99 and 7,290.06

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Solution

The fourth proportional to 20,618.95, 30,928.99 and 7,290.06 is: 10,935.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,618.95 : 30,928.99 = 7,290.06 : x
  2. Step 2: Convert to fraction form
    20,618.95/30,928.99 = 7,290.06/x
  3. Step 3: Cross multiply
    20,618.95x = 30,928.99 × 7,290.06
  4. Step 4: Simplify right side
    20,618.95x = 225,474,038.19
  5. Step 5: Solve for x
    x = 225,474,038.19/20,618.95
  6. Step 6: Final answer
    x = 10,935.28

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1.5x scale

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.