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Finding the Fourth Proportional to 786.51, 1,178.61 and 439.42

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Solution

The fourth proportional to 786.51, 1,178.61 and 439.42 is: 658.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.51 : 1,178.61 = 439.42 : x
  2. Step 2: Convert to fraction form
    786.51/1,178.61 = 439.42/x
  3. Step 3: Cross multiply
    786.51x = 1,178.61 × 439.42
  4. Step 4: Simplify right side
    786.51x = 517,904.81
  5. Step 5: Solve for x
    x = 517,904.81/786.51
  6. Step 6: Final answer
    x = 658.48

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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.