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Finding the Fourth Proportional to 1,302.78, 1,952.71 and 685.16

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Solution

The fourth proportional to 1,302.78, 1,952.71 and 685.16 is: 1,026.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,302.78 : 1,952.71 = 685.16 : x
  2. Step 2: Convert to fraction form
    1,302.78/1,952.71 = 685.16/x
  3. Step 3: Cross multiply
    1,302.78x = 1,952.71 × 685.16
  4. Step 4: Simplify right side
    1,302.78x = 1,337,914.63
  5. Step 5: Solve for x
    x = 1,337,914.63/1,302.78
  6. Step 6: Final answer
    x = 1,026.97

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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.