Home / 1,274.48-1,756.38-919.78

Finding the Fourth Proportional to 1,274.48, 1,756.38 and 919.78

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Solution

The fourth proportional to 1,274.48, 1,756.38 and 919.78 is: 1,267.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.48 : 1,756.38 = 919.78 : x
  2. Step 2: Convert to fraction form
    1,274.48/1,756.38 = 919.78/x
  3. Step 3: Cross multiply
    1,274.48x = 1,756.38 × 919.78
  4. Step 4: Simplify right side
    1,274.48x = 1,615,487.19
  5. Step 5: Solve for x
    x = 1,615,487.19/1,274.48
  6. Step 6: Final answer
    x = 1,267.56

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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.