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Finding the Fourth Proportional to 1,921.31, 2,880.25 and 751.04

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Solution

The fourth proportional to 1,921.31, 2,880.25 and 751.04 is: 1,125.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.31 : 2,880.25 = 751.04 : x
  2. Step 2: Convert to fraction form
    1,921.31/2,880.25 = 751.04/x
  3. Step 3: Cross multiply
    1,921.31x = 2,880.25 × 751.04
  4. Step 4: Simplify right side
    1,921.31x = 2,163,179.20
  5. Step 5: Solve for x
    x = 2,163,179.20/1,921.31
  6. Step 6: Final answer
    x = 1,125.89

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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.