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Finding the Fourth Proportional to 28,131,091.20, 42,196,636.80 and 28,131,091.20

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Solution

The fourth proportional to 28,131,091.20, 42,196,636.80 and 28,131,091.20 is: 42,196,636.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,131,091.20 : 42,196,636.80 = 28,131,091.20 : x
  2. Step 2: Convert to fraction form
    28,131,091.20/42,196,636.80 = 28,131,091.20/x
  3. Step 3: Cross multiply
    28,131,091.20x = 42,196,636.80 × 28,131,091.20
  4. Step 4: Simplify right side
    28,131,091.20x = 1,187,037,438,154,076
  5. Step 5: Solve for x
    x = 1,187,037,438,154,076/28,131,091.20
  6. Step 6: Final answer
    x = 42,196,636.80

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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.