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Finding the Fourth Proportional to 28,416,419.82, 39,211,731.04 and 20,978,038.01

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Solution

The fourth proportional to 28,416,419.82, 39,211,731.04 and 20,978,038.01 is: 28,947,530.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,416,419.82 : 39,211,731.04 = 20,978,038.01 : x
  2. Step 2: Convert to fraction form
    28,416,419.82/39,211,731.04 = 20,978,038.01/x
  3. Step 3: Cross multiply
    28,416,419.82x = 39,211,731.04 × 20,978,038.01
  4. Step 4: Simplify right side
    28,416,419.82x = 822,585,184,195,016.88
  5. Step 5: Solve for x
    x = 822,585,184,195,016.88/28,416,419.82
  6. Step 6: Final answer
    x = 28,947,530.67

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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.