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Finding the Fourth Proportional to 785.36, 1,178.16 and 208.28

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Solution

The fourth proportional to 785.36, 1,178.16 and 208.28 is: 312.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.36 : 1,178.16 = 208.28 : x
  2. Step 2: Convert to fraction form
    785.36/1,178.16 = 208.28/x
  3. Step 3: Cross multiply
    785.36x = 1,178.16 × 208.28
  4. Step 4: Simplify right side
    785.36x = 245,387.16
  5. Step 5: Solve for x
    x = 245,387.16/785.36
  6. Step 6: Final answer
    x = 312.45

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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.