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Finding the Fourth Proportional to 20,958.95, 28,923.47 and 11,398.95

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Solution

The fourth proportional to 20,958.95, 28,923.47 and 11,398.95 is: 15,730.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,958.95 : 28,923.47 = 11,398.95 : x
  2. Step 2: Convert to fraction form
    20,958.95/28,923.47 = 11,398.95/x
  3. Step 3: Cross multiply
    20,958.95x = 28,923.47 × 11,398.95
  4. Step 4: Simplify right side
    20,958.95x = 329,697,188.36
  5. Step 5: Solve for x
    x = 329,697,188.36/20,958.95
  6. Step 6: Final answer
    x = 15,730.62

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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.