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Finding the Fourth Proportional to 1,685.52, 2,326.08 and 987.28

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Solution

The fourth proportional to 1,685.52, 2,326.08 and 987.28 is: 1,362.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,685.52 : 2,326.08 = 987.28 : x
  2. Step 2: Convert to fraction form
    1,685.52/2,326.08 = 987.28/x
  3. Step 3: Cross multiply
    1,685.52x = 2,326.08 × 987.28
  4. Step 4: Simplify right side
    1,685.52x = 2,296,492.26
  5. Step 5: Solve for x
    x = 2,296,492.26/1,685.52
  6. Step 6: Final answer
    x = 1,362.48

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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.