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Finding the Fourth Proportional to 785.69, 1,178.71 and 368.91

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Solution

The fourth proportional to 785.69, 1,178.71 and 368.91 is: 553.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.69 : 1,178.71 = 368.91 : x
  2. Step 2: Convert to fraction form
    785.69/1,178.71 = 368.91/x
  3. Step 3: Cross multiply
    785.69x = 1,178.71 × 368.91
  4. Step 4: Simplify right side
    785.69x = 434,836.98
  5. Step 5: Solve for x
    x = 434,836.98/785.69
  6. Step 6: Final answer
    x = 553.45

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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.