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Finding the Fourth Proportional to 20,574, 28,395.36 and 12,188.88

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Solution

The fourth proportional to 20,574, 28,395.36 and 12,188.88 is: 16,822.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,574 : 28,395.36 = 12,188.88 : x
  2. Step 2: Convert to fraction form
    20,574/28,395.36 = 12,188.88/x
  3. Step 3: Cross multiply
    20,574x = 28,395.36 × 12,188.88
  4. Step 4: Simplify right side
    20,574x = 346,107,635.60
  5. Step 5: Solve for x
    x = 346,107,635.60/20,574
  6. Step 6: Final answer
    x = 16,822.57

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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.