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Finding the Fourth Proportional to 28,515.60, 42,708.60 and 16,851.60

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Solution

The fourth proportional to 28,515.60, 42,708.60 and 16,851.60 is: 25,239.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,515.60 : 42,708.60 = 16,851.60 : x
  2. Step 2: Convert to fraction form
    28,515.60/42,708.60 = 16,851.60/x
  3. Step 3: Cross multiply
    28,515.60x = 42,708.60 × 16,851.60
  4. Step 4: Simplify right side
    28,515.60x = 719,708,243.76
  5. Step 5: Solve for x
    x = 719,708,243.76/28,515.60
  6. Step 6: Final answer
    x = 25,239.11

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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.