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Finding the Fourth Proportional to 959.86, 1,439.79 and 788.50

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Solution

The fourth proportional to 959.86, 1,439.79 and 788.50 is: 1,182.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.86 : 1,439.79 = 788.50 : x
  2. Step 2: Convert to fraction form
    959.86/1,439.79 = 788.50/x
  3. Step 3: Cross multiply
    959.86x = 1,439.79 × 788.50
  4. Step 4: Simplify right side
    959.86x = 1,135,274.42
  5. Step 5: Solve for x
    x = 1,135,274.42/959.86
  6. Step 6: Final answer
    x = 1,182.75

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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.