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Finding the Fourth Proportional to 71,812.48, 99,089.40 and 39,980.56

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Solution

The fourth proportional to 71,812.48, 99,089.40 and 39,980.56 is: 55,166.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,812.48 : 99,089.40 = 39,980.56 : x
  2. Step 2: Convert to fraction form
    71,812.48/99,089.40 = 39,980.56/x
  3. Step 3: Cross multiply
    71,812.48x = 99,089.40 × 39,980.56
  4. Step 4: Simplify right side
    71,812.48x = 3,961,649,702.06
  5. Step 5: Solve for x
    x = 3,961,649,702.06/71,812.48
  6. Step 6: Final answer
    x = 55,166.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.