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Finding the Fourth Proportional to 455,428.80, 683,143.20 and 139,844.70

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Solution

The fourth proportional to 455,428.80, 683,143.20 and 139,844.70 is: 209,767.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,428.80 : 683,143.20 = 139,844.70 : x
  2. Step 2: Convert to fraction form
    455,428.80/683,143.20 = 139,844.70/x
  3. Step 3: Cross multiply
    455,428.80x = 683,143.20 × 139,844.70
  4. Step 4: Simplify right side
    455,428.80x = 95,533,955,861.04
  5. Step 5: Solve for x
    x = 95,533,955,861.04/455,428.80
  6. Step 6: Final answer
    x = 209,767.05

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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.