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Finding the Fourth Proportional to 18,129.99, 25,019.36 and 10,172.95

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Solution

The fourth proportional to 18,129.99, 25,019.36 and 10,172.95 is: 14,038.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,129.99 : 25,019.36 = 10,172.95 : x
  2. Step 2: Convert to fraction form
    18,129.99/25,019.36 = 10,172.95/x
  3. Step 3: Cross multiply
    18,129.99x = 25,019.36 × 10,172.95
  4. Step 4: Simplify right side
    18,129.99x = 254,520,647.45
  5. Step 5: Solve for x
    x = 254,520,647.45/18,129.99
  6. Step 6: Final answer
    x = 14,038.66

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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.