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Finding the Fourth Proportional to 455,959.40, 683,939.10 and 419,217.80

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Solution

The fourth proportional to 455,959.40, 683,939.10 and 419,217.80 is: 628,826.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,959.40 : 683,939.10 = 419,217.80 : x
  2. Step 2: Convert to fraction form
    455,959.40/683,939.10 = 419,217.80/x
  3. Step 3: Cross multiply
    455,959.40x = 683,939.10 × 419,217.80
  4. Step 4: Simplify right side
    455,959.40x = 286,719,444,835.98
  5. Step 5: Solve for x
    x = 286,719,444,835.98/455,959.40
  6. Step 6: Final answer
    x = 628,826.70

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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.