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Finding the Fourth Proportional to 28,442.67, 42,664.20 and 18,643.98

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Solution

The fourth proportional to 28,442.67, 42,664.20 and 18,643.98 is: 27,966.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,442.67 : 42,664.20 = 18,643.98 : x
  2. Step 2: Convert to fraction form
    28,442.67/42,664.20 = 18,643.98/x
  3. Step 3: Cross multiply
    28,442.67x = 42,664.20 × 18,643.98
  4. Step 4: Simplify right side
    28,442.67x = 795,430,491.52
  5. Step 5: Solve for x
    x = 795,430,491.52/28,442.67
  6. Step 6: Final answer
    x = 27,966.10

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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.