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Finding the Fourth Proportional to 858.45, 1,289.13 and 814.62

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Solution

The fourth proportional to 858.45, 1,289.13 and 814.62 is: 1,223.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.45 : 1,289.13 = 814.62 : x
  2. Step 2: Convert to fraction form
    858.45/1,289.13 = 814.62/x
  3. Step 3: Cross multiply
    858.45x = 1,289.13 × 814.62
  4. Step 4: Simplify right side
    858.45x = 1,050,151.08
  5. Step 5: Solve for x
    x = 1,050,151.08/858.45
  6. Step 6: Final answer
    x = 1,223.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.