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Finding the Fourth Proportional to 28,672.36, 42,978.30 and 13,100.20

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Solution

The fourth proportional to 28,672.36, 42,978.30 and 13,100.20 is: 19,636.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,672.36 : 42,978.30 = 13,100.20 : x
  2. Step 2: Convert to fraction form
    28,672.36/42,978.30 = 13,100.20/x
  3. Step 3: Cross multiply
    28,672.36x = 42,978.30 × 13,100.20
  4. Step 4: Simplify right side
    28,672.36x = 563,024,325.66
  5. Step 5: Solve for x
    x = 563,024,325.66/28,672.36
  6. Step 6: Final answer
    x = 19,636.48

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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.