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Finding the Fourth Proportional to 786.49, 1,178.76 and 324.02

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Solution

The fourth proportional to 786.49, 1,178.76 and 324.02 is: 485.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.49 : 1,178.76 = 324.02 : x
  2. Step 2: Convert to fraction form
    786.49/1,178.76 = 324.02/x
  3. Step 3: Cross multiply
    786.49x = 1,178.76 × 324.02
  4. Step 4: Simplify right side
    786.49x = 381,941.82
  5. Step 5: Solve for x
    x = 381,941.82/786.49
  6. Step 6: Final answer
    x = 485.63

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1.5x scale

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.