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Finding the Fourth Proportional to 455,348.70, 638,421.30 and 455,348.70

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Solution

The fourth proportional to 455,348.70, 638,421.30 and 455,348.70 is: 638,421.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,348.70 : 638,421.30 = 455,348.70 : x
  2. Step 2: Convert to fraction form
    455,348.70/638,421.30 = 455,348.70/x
  3. Step 3: Cross multiply
    455,348.70x = 638,421.30 × 455,348.70
  4. Step 4: Simplify right side
    455,348.70x = 290,704,309,007.31
  5. Step 5: Solve for x
    x = 290,704,309,007.31/455,348.70
  6. Step 6: Final answer
    x = 638,421.30

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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.