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Finding the Fourth Proportional to 859.60, 1,288.32 and 397.36

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Solution

The fourth proportional to 859.60, 1,288.32 and 397.36 is: 595.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.60 : 1,288.32 = 397.36 : x
  2. Step 2: Convert to fraction form
    859.60/1,288.32 = 397.36/x
  3. Step 3: Cross multiply
    859.60x = 1,288.32 × 397.36
  4. Step 4: Simplify right side
    859.60x = 511,926.84
  5. Step 5: Solve for x
    x = 511,926.84/859.60
  6. Step 6: Final answer
    x = 595.54

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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.