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Finding the Fourth Proportional to 65,663,919.80, 98,495,879.70 and 20,219,809.40

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Solution

The fourth proportional to 65,663,919.80, 98,495,879.70 and 20,219,809.40 is: 30,329,714.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,663,919.80 : 98,495,879.70 = 20,219,809.40 : x
  2. Step 2: Convert to fraction form
    65,663,919.80/98,495,879.70 = 20,219,809.40/x
  3. Step 3: Cross multiply
    65,663,919.80x = 98,495,879.70 × 20,219,809.40
  4. Step 4: Simplify right side
    65,663,919.80x = 1,991,567,914,219,329
  5. Step 5: Solve for x
    x = 1,991,567,914,219,329/65,663,919.80
  6. Step 6: Final answer
    x = 30,329,714.10

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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.