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Finding the Fourth Proportional to 18,670.60, 25,765.86 and 10,287.88

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Solution

The fourth proportional to 18,670.60, 25,765.86 and 10,287.88 is: 14,197.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,670.60 : 25,765.86 = 10,287.88 : x
  2. Step 2: Convert to fraction form
    18,670.60/25,765.86 = 10,287.88/x
  3. Step 3: Cross multiply
    18,670.60x = 25,765.86 × 10,287.88
  4. Step 4: Simplify right side
    18,670.60x = 265,076,075.78
  5. Step 5: Solve for x
    x = 265,076,075.78/18,670.60
  6. Step 6: Final answer
    x = 14,197.51

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.