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Finding the Fourth Proportional to 71,511.80, 99,985.30 and 71,511.80

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Solution

The fourth proportional to 71,511.80, 99,985.30 and 71,511.80 is: 99,985.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,511.80 : 99,985.30 = 71,511.80 : x
  2. Step 2: Convert to fraction form
    71,511.80/99,985.30 = 71,511.80/x
  3. Step 3: Cross multiply
    71,511.80x = 99,985.30 × 71,511.80
  4. Step 4: Simplify right side
    71,511.80x = 7,150,128,776.54
  5. Step 5: Solve for x
    x = 7,150,128,776.54/71,511.80
  6. Step 6: Final answer
    x = 99,985.30

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.