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Finding the Fourth Proportional to 18,978.33, 28,468.53 and 7,886.14

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Solution

The fourth proportional to 18,978.33, 28,468.53 and 7,886.14 is: 11,829.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.33 : 28,468.53 = 7,886.14 : x
  2. Step 2: Convert to fraction form
    18,978.33/28,468.53 = 7,886.14/x
  3. Step 3: Cross multiply
    18,978.33x = 28,468.53 × 7,886.14
  4. Step 4: Simplify right side
    18,978.33x = 224,506,670.83
  5. Step 5: Solve for x
    x = 224,506,670.83/18,978.33
  6. Step 6: Final answer
    x = 11,829.64

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.