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Finding the Fourth Proportional to 1,308.51, 1,805.75 and 719.06

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Solution

The fourth proportional to 1,308.51, 1,805.75 and 719.06 is: 992.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.51 : 1,805.75 = 719.06 : x
  2. Step 2: Convert to fraction form
    1,308.51/1,805.75 = 719.06/x
  3. Step 3: Cross multiply
    1,308.51x = 1,805.75 × 719.06
  4. Step 4: Simplify right side
    1,308.51x = 1,298,442.60
  5. Step 5: Solve for x
    x = 1,298,442.60/1,308.51
  6. Step 6: Final answer
    x = 992.31

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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.