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Finding the Fourth Proportional to 991.93, 1,370.25 and 903.28

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Solution

The fourth proportional to 991.93, 1,370.25 and 903.28 is: 1,247.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.93 : 1,370.25 = 903.28 : x
  2. Step 2: Convert to fraction form
    991.93/1,370.25 = 903.28/x
  3. Step 3: Cross multiply
    991.93x = 1,370.25 × 903.28
  4. Step 4: Simplify right side
    991.93x = 1,237,719.42
  5. Step 5: Solve for x
    x = 1,237,719.42/991.93
  6. Step 6: Final answer
    x = 1,247.79

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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.