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Finding the Fourth Proportional to 1,485.99, 2,228.37 and 561.39

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Solution

The fourth proportional to 1,485.99, 2,228.37 and 561.39 is: 841.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,485.99 : 2,228.37 = 561.39 : x
  2. Step 2: Convert to fraction form
    1,485.99/2,228.37 = 561.39/x
  3. Step 3: Cross multiply
    1,485.99x = 2,228.37 × 561.39
  4. Step 4: Simplify right side
    1,485.99x = 1,250,984.63
  5. Step 5: Solve for x
    x = 1,250,984.63/1,485.99
  6. Step 6: Final answer
    x = 841.85

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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.