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Finding the Fourth Proportional to 18,129.98, 25,019.76 and 10,172.78

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Solution

The fourth proportional to 18,129.98, 25,019.76 and 10,172.78 is: 14,038.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,129.98 : 25,019.76 = 10,172.78 : x
  2. Step 2: Convert to fraction form
    18,129.98/25,019.76 = 10,172.78/x
  3. Step 3: Cross multiply
    18,129.98x = 25,019.76 × 10,172.78
  4. Step 4: Simplify right side
    18,129.98x = 254,520,514.13
  5. Step 5: Solve for x
    x = 254,520,514.13/18,129.98
  6. Step 6: Final answer
    x = 14,038.65

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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.