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Finding the Fourth Proportional to 12,478,542.70, 18,717,814.05 and 7,439,694.70

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Solution

The fourth proportional to 12,478,542.70, 18,717,814.05 and 7,439,694.70 is: 11,159,542.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,478,542.70 : 18,717,814.05 = 7,439,694.70 : x
  2. Step 2: Convert to fraction form
    12,478,542.70/18,717,814.05 = 7,439,694.70/x
  3. Step 3: Cross multiply
    12,478,542.70x = 18,717,814.05 × 7,439,694.70
  4. Step 4: Simplify right side
    12,478,542.70x = 139,254,821,983,370.55
  5. Step 5: Solve for x
    x = 139,254,821,983,370.55/12,478,542.70
  6. Step 6: Final answer
    x = 11,159,542.05

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Similar ratio
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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.