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Finding the Fourth Proportional to 74,389.84, 111,584.72 and 18,985.84

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Solution

The fourth proportional to 74,389.84, 111,584.72 and 18,985.84 is: 28,478.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,389.84 : 111,584.72 = 18,985.84 : x
  2. Step 2: Convert to fraction form
    74,389.84/111,584.72 = 18,985.84/x
  3. Step 3: Cross multiply
    74,389.84x = 111,584.72 × 18,985.84
  4. Step 4: Simplify right side
    74,389.84x = 2,118,529,640.36
  5. Step 5: Solve for x
    x = 2,118,529,640.36/74,389.84
  6. Step 6: Final answer
    x = 28,478.75

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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.