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Finding the Fourth Proportional to 1,428.57, 2,140.98 and 605.83

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Solution

The fourth proportional to 1,428.57, 2,140.98 and 605.83 is: 907.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.57 : 2,140.98 = 605.83 : x
  2. Step 2: Convert to fraction form
    1,428.57/2,140.98 = 605.83/x
  3. Step 3: Cross multiply
    1,428.57x = 2,140.98 × 605.83
  4. Step 4: Simplify right side
    1,428.57x = 1,297,069.71
  5. Step 5: Solve for x
    x = 1,297,069.71/1,428.57
  6. Step 6: Final answer
    x = 907.95

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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.