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Finding the Fourth Proportional to 72,661.80, 100,261.62 and 40,830.60

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Solution

The fourth proportional to 72,661.80, 100,261.62 and 40,830.60 is: 56,339.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,661.80 : 100,261.62 = 40,830.60 : x
  2. Step 2: Convert to fraction form
    72,661.80/100,261.62 = 40,830.60/x
  3. Step 3: Cross multiply
    72,661.80x = 100,261.62 × 40,830.60
  4. Step 4: Simplify right side
    72,661.80x = 4,093,742,101.57
  5. Step 5: Solve for x
    x = 4,093,742,101.57/72,661.80
  6. Step 6: Final answer
    x = 56,339.67

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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.