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Finding the Fourth Proportional to 8,672,405.20, 13,008,607.80 and 8,140,964.20

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Solution

The fourth proportional to 8,672,405.20, 13,008,607.80 and 8,140,964.20 is: 12,211,446.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,672,405.20 : 13,008,607.80 = 8,140,964.20 : x
  2. Step 2: Convert to fraction form
    8,672,405.20/13,008,607.80 = 8,140,964.20/x
  3. Step 3: Cross multiply
    8,672,405.20x = 13,008,607.80 × 8,140,964.20
  4. Step 4: Simplify right side
    8,672,405.20x = 105,902,610,391,640.77
  5. Step 5: Solve for x
    x = 105,902,610,391,640.77/8,672,405.20
  6. Step 6: Final answer
    x = 12,211,446.30

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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.