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Finding the Fourth Proportional to 65,663,619.80, 98,495,429.70 and 20,219,509.40

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Solution

The fourth proportional to 65,663,619.80, 98,495,429.70 and 20,219,509.40 is: 30,329,264.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,663,619.80 : 98,495,429.70 = 20,219,509.40 : x
  2. Step 2: Convert to fraction form
    65,663,619.80/98,495,429.70 = 20,219,509.40/x
  3. Step 3: Cross multiply
    65,663,619.80x = 98,495,429.70 × 20,219,509.40
  4. Step 4: Simplify right side
    65,663,619.80x = 1,991,529,266,676,189
  5. Step 5: Solve for x
    x = 1,991,529,266,676,189/65,663,619.80
  6. Step 6: Final answer
    x = 30,329,264.10

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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.