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Finding the Fourth Proportional to 28,779.78, 43,173.93 and 9,051.78

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Solution

The fourth proportional to 28,779.78, 43,173.93 and 9,051.78 is: 13,579.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,779.78 : 43,173.93 = 9,051.78 : x
  2. Step 2: Convert to fraction form
    28,779.78/43,173.93 = 9,051.78/x
  3. Step 3: Cross multiply
    28,779.78x = 43,173.93 × 9,051.78
  4. Step 4: Simplify right side
    28,779.78x = 390,800,916.10
  5. Step 5: Solve for x
    x = 390,800,916.10/28,779.78
  6. Step 6: Final answer
    x = 13,579.01

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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.