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Finding the Fourth Proportional to 1,686.54, 2,326.54 and 987.50

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Solution

The fourth proportional to 1,686.54, 2,326.54 and 987.50 is: 1,362.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686.54 : 2,326.54 = 987.50 : x
  2. Step 2: Convert to fraction form
    1,686.54/2,326.54 = 987.50/x
  3. Step 3: Cross multiply
    1,686.54x = 2,326.54 × 987.50
  4. Step 4: Simplify right side
    1,686.54x = 2,297,458.25
  5. Step 5: Solve for x
    x = 2,297,458.25/1,686.54
  6. Step 6: Final answer
    x = 1,362.23

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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.