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Finding the Fourth Proportional to 1,272.90, 1,756.48 and 741.84

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Solution

The fourth proportional to 1,272.90, 1,756.48 and 741.84 is: 1,023.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.90 : 1,756.48 = 741.84 : x
  2. Step 2: Convert to fraction form
    1,272.90/1,756.48 = 741.84/x
  3. Step 3: Cross multiply
    1,272.90x = 1,756.48 × 741.84
  4. Step 4: Simplify right side
    1,272.90x = 1,303,027.12
  5. Step 5: Solve for x
    x = 1,303,027.12/1,272.90
  6. Step 6: Final answer
    x = 1,023.67

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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.