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Finding the Fourth Proportional to 859.65, 1,289.32 and 339.49

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Solution

The fourth proportional to 859.65, 1,289.32 and 339.49 is: 509.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.65 : 1,289.32 = 339.49 : x
  2. Step 2: Convert to fraction form
    859.65/1,289.32 = 339.49/x
  3. Step 3: Cross multiply
    859.65x = 1,289.32 × 339.49
  4. Step 4: Simplify right side
    859.65x = 437,712.01
  5. Step 5: Solve for x
    x = 437,712.01/859.65
  6. Step 6: Final answer
    x = 509.18

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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.