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Finding the Fourth Proportional to 455,147.70, 638,139.90 and 455,147.70

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Solution

The fourth proportional to 455,147.70, 638,139.90 and 455,147.70 is: 638,139.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,147.70 : 638,139.90 = 455,147.70 : x
  2. Step 2: Convert to fraction form
    455,147.70/638,139.90 = 455,147.70/x
  3. Step 3: Cross multiply
    455,147.70x = 638,139.90 × 455,147.70
  4. Step 4: Simplify right side
    455,147.70x = 290,447,907,763.23
  5. Step 5: Solve for x
    x = 290,447,907,763.23/455,147.70
  6. Step 6: Final answer
    x = 638,139.90

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.