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Finding the Fourth Proportional to 101,428.47, 139,924.16 and 65,630.05

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Solution

The fourth proportional to 101,428.47, 139,924.16 and 65,630.05 is: 90,538.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,428.47 : 139,924.16 = 65,630.05 : x
  2. Step 2: Convert to fraction form
    101,428.47/139,924.16 = 65,630.05/x
  3. Step 3: Cross multiply
    101,428.47x = 139,924.16 × 65,630.05
  4. Step 4: Simplify right side
    101,428.47x = 9,183,229,185.16
  5. Step 5: Solve for x
    x = 9,183,229,185.16/101,428.47
  6. Step 6: Final answer
    x = 90,538.97

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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.