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Finding the Fourth Proportional to 74,019.78, 102,149.70 and 40,485.78

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Solution

The fourth proportional to 74,019.78, 102,149.70 and 40,485.78 is: 55,871.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,019.78 : 102,149.70 = 40,485.78 : x
  2. Step 2: Convert to fraction form
    74,019.78/102,149.70 = 40,485.78/x
  3. Step 3: Cross multiply
    74,019.78x = 102,149.70 × 40,485.78
  4. Step 4: Simplify right side
    74,019.78x = 4,135,610,281.27
  5. Step 5: Solve for x
    x = 4,135,610,281.27/74,019.78
  6. Step 6: Final answer
    x = 55,871.69

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1.5x scale

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.