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Finding the Fourth Proportional to 18,420.40, 25,419.99 and 10,036.90

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Solution

The fourth proportional to 18,420.40, 25,419.99 and 10,036.90 is: 13,850.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,420.40 : 25,419.99 = 10,036.90 : x
  2. Step 2: Convert to fraction form
    18,420.40/25,419.99 = 10,036.90/x
  3. Step 3: Cross multiply
    18,420.40x = 25,419.99 × 10,036.90
  4. Step 4: Simplify right side
    18,420.40x = 255,137,897.63
  5. Step 5: Solve for x
    x = 255,137,897.63/18,420.40
  6. Step 6: Final answer
    x = 13,850.83

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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.