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Finding the Fourth Proportional to 786.48, 1,185.12 and 749.40

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Solution

The fourth proportional to 786.48, 1,185.12 and 749.40 is: 1,129.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.48 : 1,185.12 = 749.40 : x
  2. Step 2: Convert to fraction form
    786.48/1,185.12 = 749.40/x
  3. Step 3: Cross multiply
    786.48x = 1,185.12 × 749.40
  4. Step 4: Simplify right side
    786.48x = 888,128.93
  5. Step 5: Solve for x
    x = 888,128.93/786.48
  6. Step 6: Final answer
    x = 1,129.25

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.