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Finding the Fourth Proportional to 71,317.80, 106,976.70 and 66,652.20

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Solution

The fourth proportional to 71,317.80, 106,976.70 and 66,652.20 is: 99,978.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,317.80 : 106,976.70 = 66,652.20 : x
  2. Step 2: Convert to fraction form
    71,317.80/106,976.70 = 66,652.20/x
  3. Step 3: Cross multiply
    71,317.80x = 106,976.70 × 66,652.20
  4. Step 4: Simplify right side
    71,317.80x = 7,130,232,403.74
  5. Step 5: Solve for x
    x = 7,130,232,403.74/71,317.80
  6. Step 6: Final answer
    x = 99,978.30

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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.