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Finding the Fourth Proportional to 1,245.06, 1,866.60 and 854.10

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Solution

The fourth proportional to 1,245.06, 1,866.60 and 854.10 is: 1,280.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.06 : 1,866.60 = 854.10 : x
  2. Step 2: Convert to fraction form
    1,245.06/1,866.60 = 854.10/x
  3. Step 3: Cross multiply
    1,245.06x = 1,866.60 × 854.10
  4. Step 4: Simplify right side
    1,245.06x = 1,594,263.06
  5. Step 5: Solve for x
    x = 1,594,263.06/1,245.06
  6. Step 6: Final answer
    x = 1,280.47

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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.