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Finding the Fourth Proportional to 959.45, 1,439.47 and 439.43

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Solution

The fourth proportional to 959.45, 1,439.47 and 439.43 is: 659.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.45 : 1,439.47 = 439.43 : x
  2. Step 2: Convert to fraction form
    959.45/1,439.47 = 439.43/x
  3. Step 3: Cross multiply
    959.45x = 1,439.47 × 439.43
  4. Step 4: Simplify right side
    959.45x = 632,539.10
  5. Step 5: Solve for x
    x = 632,539.10/959.45
  6. Step 6: Final answer
    x = 659.28

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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.