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Finding the Fourth Proportional to 74,785.79, 112,305.65 and 49,985.21

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Solution

The fourth proportional to 74,785.79, 112,305.65 and 49,985.21 is: 75,062.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,785.79 : 112,305.65 = 49,985.21 : x
  2. Step 2: Convert to fraction form
    74,785.79/112,305.65 = 49,985.21/x
  3. Step 3: Cross multiply
    74,785.79x = 112,305.65 × 49,985.21
  4. Step 4: Simplify right side
    74,785.79x = 5,613,620,687.98
  5. Step 5: Solve for x
    x = 5,613,620,687.98/74,785.79
  6. Step 6: Final answer
    x = 75,062.67

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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.