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Finding the Fourth Proportional to 18,721,864.60, 28,061,801.70 and 9,620,445.40

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Solution

The fourth proportional to 18,721,864.60, 28,061,801.70 and 9,620,445.40 is: 14,419,879.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721,864.60 : 28,061,801.70 = 9,620,445.40 : x
  2. Step 2: Convert to fraction form
    18,721,864.60/28,061,801.70 = 9,620,445.40/x
  3. Step 3: Cross multiply
    18,721,864.60x = 28,061,801.70 × 9,620,445.40
  4. Step 4: Simplify right side
    18,721,864.60x = 269,967,031,080,477.19
  5. Step 5: Solve for x
    x = 269,967,031,080,477.19/18,721,864.60
  6. Step 6: Final answer
    x = 14,419,879.48

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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.