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Finding the Fourth Proportional to 1,028.94, 1,420.14 and 586.80

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Solution

The fourth proportional to 1,028.94, 1,420.14 and 586.80 is: 809.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.94 : 1,420.14 = 586.80 : x
  2. Step 2: Convert to fraction form
    1,028.94/1,420.14 = 586.80/x
  3. Step 3: Cross multiply
    1,028.94x = 1,420.14 × 586.80
  4. Step 4: Simplify right side
    1,028.94x = 833,338.15
  5. Step 5: Solve for x
    x = 833,338.15/1,028.94
  6. Step 6: Final answer
    x = 809.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.