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Finding the Fourth Proportional to 73,130.40, 100,928.16 and 61,172.64

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Solution

The fourth proportional to 73,130.40, 100,928.16 and 61,172.64 is: 84,425.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,130.40 : 100,928.16 = 61,172.64 : x
  2. Step 2: Convert to fraction form
    73,130.40/100,928.16 = 61,172.64/x
  3. Step 3: Cross multiply
    73,130.40x = 100,928.16 × 61,172.64
  4. Step 4: Simplify right side
    73,130.40x = 6,174,041,997.54
  5. Step 5: Solve for x
    x = 6,174,041,997.54/73,130.40
  6. Step 6: Final answer
    x = 84,425.11

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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.