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Finding the Fourth Proportional to 959.30, 1,439.57 and 612.89

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Solution

The fourth proportional to 959.30, 1,439.57 and 612.89 is: 919.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.30 : 1,439.57 = 612.89 : x
  2. Step 2: Convert to fraction form
    959.30/1,439.57 = 612.89/x
  3. Step 3: Cross multiply
    959.30x = 1,439.57 × 612.89
  4. Step 4: Simplify right side
    959.30x = 882,298.06
  5. Step 5: Solve for x
    x = 882,298.06/959.30
  6. Step 6: Final answer
    x = 919.73

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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.