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Finding the Fourth Proportional to 959.61, 1,439.46 and 439.64

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Solution

The fourth proportional to 959.61, 1,439.46 and 439.64 is: 659.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.61 : 1,439.46 = 439.64 : x
  2. Step 2: Convert to fraction form
    959.61/1,439.46 = 439.64/x
  3. Step 3: Cross multiply
    959.61x = 1,439.46 × 439.64
  4. Step 4: Simplify right side
    959.61x = 632,844.19
  5. Step 5: Solve for x
    x = 632,844.19/959.61
  6. Step 6: Final answer
    x = 659.48

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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.