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Finding the Fourth Proportional to 829.98, 1,145.38 and 456.98

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Solution

The fourth proportional to 829.98, 1,145.38 and 456.98 is: 630.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.98 : 1,145.38 = 456.98 : x
  2. Step 2: Convert to fraction form
    829.98/1,145.38 = 456.98/x
  3. Step 3: Cross multiply
    829.98x = 1,145.38 × 456.98
  4. Step 4: Simplify right side
    829.98x = 523,415.75
  5. Step 5: Solve for x
    x = 523,415.75/829.98
  6. Step 6: Final answer
    x = 630.64

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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.