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Finding the Fourth Proportional to 18,878.62, 28,321.35 and 7,779.14

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Solution

The fourth proportional to 18,878.62, 28,321.35 and 7,779.14 is: 11,670.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,878.62 : 28,321.35 = 7,779.14 : x
  2. Step 2: Convert to fraction form
    18,878.62/28,321.35 = 7,779.14/x
  3. Step 3: Cross multiply
    18,878.62x = 28,321.35 × 7,779.14
  4. Step 4: Simplify right side
    18,878.62x = 220,315,566.14
  5. Step 5: Solve for x
    x = 220,315,566.14/18,878.62
  6. Step 6: Final answer
    x = 11,670.11

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1.5x scale

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.