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Finding the Fourth Proportional to 455,920.80, 639,688.80 and 455,920.80

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Solution

The fourth proportional to 455,920.80, 639,688.80 and 455,920.80 is: 639,688.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,920.80 : 639,688.80 = 455,920.80 : x
  2. Step 2: Convert to fraction form
    455,920.80/639,688.80 = 455,920.80/x
  3. Step 3: Cross multiply
    455,920.80x = 639,688.80 × 455,920.80
  4. Step 4: Simplify right side
    455,920.80x = 291,647,429,447.04
  5. Step 5: Solve for x
    x = 291,647,429,447.04/455,920.80
  6. Step 6: Final answer
    x = 639,688.80

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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.