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Finding the Fourth Proportional to 74,485.40, 111,728.10 and 71,029.40

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Solution

The fourth proportional to 74,485.40, 111,728.10 and 71,029.40 is: 106,544.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,485.40 : 111,728.10 = 71,029.40 : x
  2. Step 2: Convert to fraction form
    74,485.40/111,728.10 = 71,029.40/x
  3. Step 3: Cross multiply
    74,485.40x = 111,728.10 × 71,029.40
  4. Step 4: Simplify right side
    74,485.40x = 7,935,979,906.14
  5. Step 5: Solve for x
    x = 7,935,979,906.14/74,485.40
  6. Step 6: Final answer
    x = 106,544.10

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1.5x scale

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.