Home / 81,985.61-122,991.36-28,692.47

Finding the Fourth Proportional to 81,985.61, 122,991.36 and 28,692.47

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Solution

The fourth proportional to 81,985.61, 122,991.36 and 28,692.47 is: 43,043.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,985.61 : 122,991.36 = 28,692.47 : x
  2. Step 2: Convert to fraction form
    81,985.61/122,991.36 = 28,692.47/x
  3. Step 3: Cross multiply
    81,985.61x = 122,991.36 × 28,692.47
  4. Step 4: Simplify right side
    81,985.61x = 3,528,925,907.06
  5. Step 5: Solve for x
    x = 3,528,925,907.06/81,985.61
  6. Step 6: Final answer
    x = 43,043.24

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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.