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Finding the Fourth Proportional to 785.52, 1,178.64 and 323.28

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Solution

The fourth proportional to 785.52, 1,178.64 and 323.28 is: 485.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.52 : 1,178.64 = 323.28 : x
  2. Step 2: Convert to fraction form
    785.52/1,178.64 = 323.28/x
  3. Step 3: Cross multiply
    785.52x = 1,178.64 × 323.28
  4. Step 4: Simplify right side
    785.52x = 381,030.74
  5. Step 5: Solve for x
    x = 381,030.74/785.52
  6. Step 6: Final answer
    x = 485.07

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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.