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Finding the Fourth Proportional to 829.84, 1,145.21 and 456.85

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Solution

The fourth proportional to 829.84, 1,145.21 and 456.85 is: 630.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.84 : 1,145.21 = 456.85 : x
  2. Step 2: Convert to fraction form
    829.84/1,145.21 = 456.85/x
  3. Step 3: Cross multiply
    829.84x = 1,145.21 × 456.85
  4. Step 4: Simplify right side
    829.84x = 523,189.19
  5. Step 5: Solve for x
    x = 523,189.19/829.84
  6. Step 6: Final answer
    x = 630.47

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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.