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Finding the Fourth Proportional to 2,770.40, 3,822.90 and 1,528.40

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Solution

The fourth proportional to 2,770.40, 3,822.90 and 1,528.40 is: 2,109.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,770.40 : 3,822.90 = 1,528.40 : x
  2. Step 2: Convert to fraction form
    2,770.40/3,822.90 = 1,528.40/x
  3. Step 3: Cross multiply
    2,770.40x = 3,822.90 × 1,528.40
  4. Step 4: Simplify right side
    2,770.40x = 5,842,920.36
  5. Step 5: Solve for x
    x = 5,842,920.36/2,770.40
  6. Step 6: Final answer
    x = 2,109.05

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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.