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Finding the Fourth Proportional to 1,308.16, 1,802.88 and 998.40

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Solution

The fourth proportional to 1,308.16, 1,802.88 and 998.40 is: 1,375.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.16 : 1,802.88 = 998.40 : x
  2. Step 2: Convert to fraction form
    1,308.16/1,802.88 = 998.40/x
  3. Step 3: Cross multiply
    1,308.16x = 1,802.88 × 998.40
  4. Step 4: Simplify right side
    1,308.16x = 1,799,995.39
  5. Step 5: Solve for x
    x = 1,799,995.39/1,308.16
  6. Step 6: Final answer
    x = 1,375.97

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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.