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Finding the Fourth Proportional to 1,099.65, 1,646.64 and 728.31

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Solution

The fourth proportional to 1,099.65, 1,646.64 and 728.31 is: 1,090.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.65 : 1,646.64 = 728.31 : x
  2. Step 2: Convert to fraction form
    1,099.65/1,646.64 = 728.31/x
  3. Step 3: Cross multiply
    1,099.65x = 1,646.64 × 728.31
  4. Step 4: Simplify right side
    1,099.65x = 1,199,264.38
  5. Step 5: Solve for x
    x = 1,199,264.38/1,099.65
  6. Step 6: Final answer
    x = 1,090.59

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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.