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Finding the Fourth Proportional to 1,238.90, 1,707.90 and 766.48

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Solution

The fourth proportional to 1,238.90, 1,707.90 and 766.48 is: 1,056.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.90 : 1,707.90 = 766.48 : x
  2. Step 2: Convert to fraction form
    1,238.90/1,707.90 = 766.48/x
  3. Step 3: Cross multiply
    1,238.90x = 1,707.90 × 766.48
  4. Step 4: Simplify right side
    1,238.90x = 1,309,071.19
  5. Step 5: Solve for x
    x = 1,309,071.19/1,238.90
  6. Step 6: Final answer
    x = 1,056.64

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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.