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Finding the Fourth Proportional to 1,955.04, 2,929.79 and 721.21

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Solution

The fourth proportional to 1,955.04, 2,929.79 and 721.21 is: 1,080.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,955.04 : 2,929.79 = 721.21 : x
  2. Step 2: Convert to fraction form
    1,955.04/2,929.79 = 721.21/x
  3. Step 3: Cross multiply
    1,955.04x = 2,929.79 × 721.21
  4. Step 4: Simplify right side
    1,955.04x = 2,112,988.32
  5. Step 5: Solve for x
    x = 2,112,988.32/1,955.04
  6. Step 6: Final answer
    x = 1,080.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.