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Finding the Fourth Proportional to 1,087.63, 1,501.23 and 645.84

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Solution

The fourth proportional to 1,087.63, 1,501.23 and 645.84 is: 891.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.63 : 1,501.23 = 645.84 : x
  2. Step 2: Convert to fraction form
    1,087.63/1,501.23 = 645.84/x
  3. Step 3: Cross multiply
    1,087.63x = 1,501.23 × 645.84
  4. Step 4: Simplify right side
    1,087.63x = 969,556.81
  5. Step 5: Solve for x
    x = 969,556.81/1,087.63
  6. Step 6: Final answer
    x = 891.44

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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.