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Finding the Fourth Proportional to 829.95, 1,145.19 and 475.86

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Solution

The fourth proportional to 829.95, 1,145.19 and 475.86 is: 656.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.95 : 1,145.19 = 475.86 : x
  2. Step 2: Convert to fraction form
    829.95/1,145.19 = 475.86/x
  3. Step 3: Cross multiply
    829.95x = 1,145.19 × 475.86
  4. Step 4: Simplify right side
    829.95x = 544,950.11
  5. Step 5: Solve for x
    x = 544,950.11/829.95
  6. Step 6: Final answer
    x = 656.61

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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.