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Finding the Fourth Proportional to 12,590,478.40, 18,913,711.20 and 12,114,587.20

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Solution

The fourth proportional to 12,590,478.40, 18,913,711.20 and 12,114,587.20 is: 18,198,816.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,590,478.40 : 18,913,711.20 = 12,114,587.20 : x
  2. Step 2: Convert to fraction form
    12,590,478.40/18,913,711.20 = 12,114,587.20/x
  3. Step 3: Cross multiply
    12,590,478.40x = 18,913,711.20 × 12,114,587.20
  4. Step 4: Simplify right side
    12,590,478.40x = 229,131,803,608,016.62
  5. Step 5: Solve for x
    x = 229,131,803,608,016.62/12,590,478.40
  6. Step 6: Final answer
    x = 18,198,816.31

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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.