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Finding the Fourth Proportional to 1,291.40, 1,749.15 and 1,291.40

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Solution

The fourth proportional to 1,291.40, 1,749.15 and 1,291.40 is: 1,749.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.40 : 1,749.15 = 1,291.40 : x
  2. Step 2: Convert to fraction form
    1,291.40/1,749.15 = 1,291.40/x
  3. Step 3: Cross multiply
    1,291.40x = 1,749.15 × 1,291.40
  4. Step 4: Simplify right side
    1,291.40x = 2,258,852.31
  5. Step 5: Solve for x
    x = 2,258,852.31/1,291.40
  6. Step 6: Final answer
    x = 1,749.15

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.