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Finding the Fourth Proportional to 18,415.90, 25,412.73 and 10,860.50

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Solution

The fourth proportional to 18,415.90, 25,412.73 and 10,860.50 is: 14,986.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,415.90 : 25,412.73 = 10,860.50 : x
  2. Step 2: Convert to fraction form
    18,415.90/25,412.73 = 10,860.50/x
  3. Step 3: Cross multiply
    18,415.90x = 25,412.73 × 10,860.50
  4. Step 4: Simplify right side
    18,415.90x = 275,994,954.17
  5. Step 5: Solve for x
    x = 275,994,954.17/18,415.90
  6. Step 6: Final answer
    x = 14,986.78

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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.