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Finding the Fourth Proportional to 1,808.31, 2,712.47 and 987.28

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Solution

The fourth proportional to 1,808.31, 2,712.47 and 987.28 is: 1,480.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,808.31 : 2,712.47 = 987.28 : x
  2. Step 2: Convert to fraction form
    1,808.31/2,712.47 = 987.28/x
  3. Step 3: Cross multiply
    1,808.31x = 2,712.47 × 987.28
  4. Step 4: Simplify right side
    1,808.31x = 2,677,967.38
  5. Step 5: Solve for x
    x = 2,677,967.38/1,808.31
  6. Step 6: Final answer
    x = 1,480.92

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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.