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Finding the Fourth Proportional to 455,418.80, 683,128.20 and 139,834.70

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Solution

The fourth proportional to 455,418.80, 683,128.20 and 139,834.70 is: 209,752.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,418.80 : 683,128.20 = 139,834.70 : x
  2. Step 2: Convert to fraction form
    455,418.80/683,128.20 = 139,834.70/x
  3. Step 3: Cross multiply
    455,418.80x = 683,128.20 × 139,834.70
  4. Step 4: Simplify right side
    455,418.80x = 95,525,026,908.54
  5. Step 5: Solve for x
    x = 95,525,026,908.54/455,418.80
  6. Step 6: Final answer
    x = 209,752.05

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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.