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Finding the Fourth Proportional to 18,803.90, 25,949.40 and 10,420.40

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Solution

The fourth proportional to 18,803.90, 25,949.40 and 10,420.40 is: 14,380.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,803.90 : 25,949.40 = 10,420.40 : x
  2. Step 2: Convert to fraction form
    18,803.90/25,949.40 = 10,420.40/x
  3. Step 3: Cross multiply
    18,803.90x = 25,949.40 × 10,420.40
  4. Step 4: Simplify right side
    18,803.90x = 270,403,127.76
  5. Step 5: Solve for x
    x = 270,403,127.76/18,803.90
  6. Step 6: Final answer
    x = 14,380.16

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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.