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Finding the Fourth Proportional to 1,087.84, 1,501.44 and 646

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Solution

The fourth proportional to 1,087.84, 1,501.44 and 646 is: 891.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.84 : 1,501.44 = 646 : x
  2. Step 2: Convert to fraction form
    1,087.84/1,501.44 = 646/x
  3. Step 3: Cross multiply
    1,087.84x = 1,501.44 × 646
  4. Step 4: Simplify right side
    1,087.84x = 969,930.24
  5. Step 5: Solve for x
    x = 969,930.24/1,087.84
  6. Step 6: Final answer
    x = 891.61

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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.