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Finding the Fourth Proportional to 72,421.40, 108,632.10 and 40,928.60

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Solution

The fourth proportional to 72,421.40, 108,632.10 and 40,928.60 is: 61,392.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,421.40 : 108,632.10 = 40,928.60 : x
  2. Step 2: Convert to fraction form
    72,421.40/108,632.10 = 40,928.60/x
  3. Step 3: Cross multiply
    72,421.40x = 108,632.10 × 40,928.60
  4. Step 4: Simplify right side
    72,421.40x = 4,446,159,768.06
  5. Step 5: Solve for x
    x = 4,446,159,768.06/72,421.40
  6. Step 6: Final answer
    x = 61,392.90

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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.