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Finding the Fourth Proportional to 1,274.84, 1,759.42 and 921.88

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Solution

The fourth proportional to 1,274.84, 1,759.42 and 921.88 is: 1,272.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.84 : 1,759.42 = 921.88 : x
  2. Step 2: Convert to fraction form
    1,274.84/1,759.42 = 921.88/x
  3. Step 3: Cross multiply
    1,274.84x = 1,759.42 × 921.88
  4. Step 4: Simplify right side
    1,274.84x = 1,621,977.46
  5. Step 5: Solve for x
    x = 1,621,977.46/1,274.84
  6. Step 6: Final answer
    x = 1,272.30

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1.5x scale

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.