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Finding the Fourth Proportional to 1,287.23, 1,775.75 and 867.05

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Solution

The fourth proportional to 1,287.23, 1,775.75 and 867.05 is: 1,196.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.23 : 1,775.75 = 867.05 : x
  2. Step 2: Convert to fraction form
    1,287.23/1,775.75 = 867.05/x
  3. Step 3: Cross multiply
    1,287.23x = 1,775.75 × 867.05
  4. Step 4: Simplify right side
    1,287.23x = 1,539,650.82
  5. Step 5: Solve for x
    x = 1,539,650.82/1,287.23
  6. Step 6: Final answer
    x = 1,196.09

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1.5x scale

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.