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Finding the Fourth Proportional to 20,950.98, 28,900.08 and 13,498.98

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Solution

The fourth proportional to 20,950.98, 28,900.08 and 13,498.98 is: 18,620.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,950.98 : 28,900.08 = 13,498.98 : x
  2. Step 2: Convert to fraction form
    20,950.98/28,900.08 = 13,498.98/x
  3. Step 3: Cross multiply
    20,950.98x = 28,900.08 × 13,498.98
  4. Step 4: Simplify right side
    20,950.98x = 390,121,601.92
  5. Step 5: Solve for x
    x = 390,121,601.92/20,950.98
  6. Step 6: Final answer
    x = 18,620.69

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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.