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Finding the Fourth Proportional to 78,784.40, 118,121.22 and 28,858.01

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Solution

The fourth proportional to 78,784.40, 118,121.22 and 28,858.01 is: 43,266.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,784.40 : 118,121.22 = 28,858.01 : x
  2. Step 2: Convert to fraction form
    78,784.40/118,121.22 = 28,858.01/x
  3. Step 3: Cross multiply
    78,784.40x = 118,121.22 × 28,858.01
  4. Step 4: Simplify right side
    78,784.40x = 3,408,742,757.37
  5. Step 5: Solve for x
    x = 3,408,742,757.37/78,784.40
  6. Step 6: Final answer
    x = 43,266.72

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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.