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Finding the Fourth Proportional to 1,528.28, 2,109 and 829.64

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Solution

The fourth proportional to 1,528.28, 2,109 and 829.64 is: 1,144.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,528.28 : 2,109 = 829.64 : x
  2. Step 2: Convert to fraction form
    1,528.28/2,109 = 829.64/x
  3. Step 3: Cross multiply
    1,528.28x = 2,109 × 829.64
  4. Step 4: Simplify right side
    1,528.28x = 1,749,710.76
  5. Step 5: Solve for x
    x = 1,749,710.76/1,528.28
  6. Step 6: Final answer
    x = 1,144.89

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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.