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Finding the Fourth Proportional to 18,803.80, 25,946.86 and 10,420.12

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Solution

The fourth proportional to 18,803.80, 25,946.86 and 10,420.12 is: 14,378.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,803.80 : 25,946.86 = 10,420.12 : x
  2. Step 2: Convert to fraction form
    18,803.80/25,946.86 = 10,420.12/x
  3. Step 3: Cross multiply
    18,803.80x = 25,946.86 × 10,420.12
  4. Step 4: Simplify right side
    18,803.80x = 270,369,394.82
  5. Step 5: Solve for x
    x = 270,369,394.82/18,803.80
  6. Step 6: Final answer
    x = 14,378.44

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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.