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Finding the Fourth Proportional to 829.88, 1,145.28 and 535.40

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Solution

The fourth proportional to 829.88, 1,145.28 and 535.40 is: 738.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.88 : 1,145.28 = 535.40 : x
  2. Step 2: Convert to fraction form
    829.88/1,145.28 = 535.40/x
  3. Step 3: Cross multiply
    829.88x = 1,145.28 × 535.40
  4. Step 4: Simplify right side
    829.88x = 613,182.91
  5. Step 5: Solve for x
    x = 613,182.91/829.88
  6. Step 6: Final answer
    x = 738.88

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Double scale
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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.