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Finding the Fourth Proportional to 1,215.60, 1,678.26 and 718.26

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Solution

The fourth proportional to 1,215.60, 1,678.26 and 718.26 is: 991.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.60 : 1,678.26 = 718.26 : x
  2. Step 2: Convert to fraction form
    1,215.60/1,678.26 = 718.26/x
  3. Step 3: Cross multiply
    1,215.60x = 1,678.26 × 718.26
  4. Step 4: Simplify right side
    1,215.60x = 1,205,427.03
  5. Step 5: Solve for x
    x = 1,205,427.03/1,215.60
  6. Step 6: Final answer
    x = 991.63

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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.