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Finding the Fourth Proportional to 12,127,971.20, 18,191,956.80 and 12,127,971.20

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Solution

The fourth proportional to 12,127,971.20, 18,191,956.80 and 12,127,971.20 is: 18,191,956.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,127,971.20 : 18,191,956.80 = 12,127,971.20 : x
  2. Step 2: Convert to fraction form
    12,127,971.20/18,191,956.80 = 12,127,971.20/x
  3. Step 3: Cross multiply
    12,127,971.20x = 18,191,956.80 × 12,127,971.20
  4. Step 4: Simplify right side
    12,127,971.20x = 220,631,528,142,044.16
  5. Step 5: Solve for x
    x = 220,631,528,142,044.16/12,127,971.20
  6. Step 6: Final answer
    x = 18,191,956.80

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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.