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Finding the Fourth Proportional to 25,980.78, 38,985.75 and 10,399.62

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Solution

The fourth proportional to 25,980.78, 38,985.75 and 10,399.62 is: 15,605.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,980.78 : 38,985.75 = 10,399.62 : x
  2. Step 2: Convert to fraction form
    25,980.78/38,985.75 = 10,399.62/x
  3. Step 3: Cross multiply
    25,980.78x = 38,985.75 × 10,399.62
  4. Step 4: Simplify right side
    25,980.78x = 405,436,985.42
  5. Step 5: Solve for x
    x = 405,436,985.42/25,980.78
  6. Step 6: Final answer
    x = 15,605.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.