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Finding the Fourth Proportional to 859.32, 1,288.53 and 339.21

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Solution

The fourth proportional to 859.32, 1,288.53 and 339.21 is: 508.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.32 : 1,288.53 = 339.21 : x
  2. Step 2: Convert to fraction form
    859.32/1,288.53 = 339.21/x
  3. Step 3: Cross multiply
    859.32x = 1,288.53 × 339.21
  4. Step 4: Simplify right side
    859.32x = 437,082.26
  5. Step 5: Solve for x
    x = 437,082.26/859.32
  6. Step 6: Final answer
    x = 508.64

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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.