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Finding the Fourth Proportional to 20,870.76, 28,797.40 and 12,369.14

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Solution

The fourth proportional to 20,870.76, 28,797.40 and 12,369.14 is: 17,066.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.76 : 28,797.40 = 12,369.14 : x
  2. Step 2: Convert to fraction form
    20,870.76/28,797.40 = 12,369.14/x
  3. Step 3: Cross multiply
    20,870.76x = 28,797.40 × 12,369.14
  4. Step 4: Simplify right side
    20,870.76x = 356,199,010.39
  5. Step 5: Solve for x
    x = 356,199,010.39/20,870.76
  6. Step 6: Final answer
    x = 17,066.90

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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.