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Finding the Fourth Proportional to 71,918.78, 107,878.08 and 19,328.24

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Solution

The fourth proportional to 71,918.78, 107,878.08 and 19,328.24 is: 28,992.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,918.78 : 107,878.08 = 19,328.24 : x
  2. Step 2: Convert to fraction form
    71,918.78/107,878.08 = 19,328.24/x
  3. Step 3: Cross multiply
    71,918.78x = 107,878.08 × 19,328.24
  4. Step 4: Simplify right side
    71,918.78x = 2,085,093,420.98
  5. Step 5: Solve for x
    x = 2,085,093,420.98/71,918.78
  6. Step 6: Final answer
    x = 28,992.34

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1.5x scale

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.