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Finding the Fourth Proportional to 74,085, 111,127.56 and 18,681

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Solution

The fourth proportional to 74,085, 111,127.56 and 18,681 is: 28,021.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,085 : 111,127.56 = 18,681 : x
  2. Step 2: Convert to fraction form
    74,085/111,127.56 = 18,681/x
  3. Step 3: Cross multiply
    74,085x = 111,127.56 × 18,681
  4. Step 4: Simplify right side
    74,085x = 2,075,973,948.36
  5. Step 5: Solve for x
    x = 2,075,973,948.36/74,085
  6. Step 6: Final answer
    x = 28,021.52

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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.