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Finding the Fourth Proportional to 990.34, 1,366.64 and 548.26

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Solution

The fourth proportional to 990.34, 1,366.64 and 548.26 is: 756.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.34 : 1,366.64 = 548.26 : x
  2. Step 2: Convert to fraction form
    990.34/1,366.64 = 548.26/x
  3. Step 3: Cross multiply
    990.34x = 1,366.64 × 548.26
  4. Step 4: Simplify right side
    990.34x = 749,272.00
  5. Step 5: Solve for x
    x = 749,272.00/990.34
  6. Step 6: Final answer
    x = 756.58

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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.