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Finding the Fourth Proportional to 18,272, 25,215.36 and 10,820

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Solution

The fourth proportional to 18,272, 25,215.36 and 10,820 is: 14,931.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,272 : 25,215.36 = 10,820 : x
  2. Step 2: Convert to fraction form
    18,272/25,215.36 = 10,820/x
  3. Step 3: Cross multiply
    18,272x = 25,215.36 × 10,820
  4. Step 4: Simplify right side
    18,272x = 272,830,195.20
  5. Step 5: Solve for x
    x = 272,830,195.20/18,272
  6. Step 6: Final answer
    x = 14,931.60

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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.