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Finding the Fourth Proportional to 1,686.36, 2,326.80 and 1,065

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Solution

The fourth proportional to 1,686.36, 2,326.80 and 1,065 is: 1,469.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686.36 : 2,326.80 = 1,065 : x
  2. Step 2: Convert to fraction form
    1,686.36/2,326.80 = 1,065/x
  3. Step 3: Cross multiply
    1,686.36x = 2,326.80 × 1,065
  4. Step 4: Simplify right side
    1,686.36x = 2,478,042
  5. Step 5: Solve for x
    x = 2,478,042/1,686.36
  6. Step 6: Final answer
    x = 1,469.46

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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.