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Finding the Fourth Proportional to 71,720.40, 107,121.72 and 64,955.88

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Solution

The fourth proportional to 71,720.40, 107,121.72 and 64,955.88 is: 97,018.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,720.40 : 107,121.72 = 64,955.88 : x
  2. Step 2: Convert to fraction form
    71,720.40/107,121.72 = 64,955.88/x
  3. Step 3: Cross multiply
    71,720.40x = 107,121.72 × 64,955.88
  4. Step 4: Simplify right side
    71,720.40x = 6,958,185,589.71
  5. Step 5: Solve for x
    x = 6,958,185,589.71/71,720.40
  6. Step 6: Final answer
    x = 97,018.22

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.