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Finding the Fourth Proportional to 786.32, 1,178.52 and 690.32

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Solution

The fourth proportional to 786.32, 1,178.52 and 690.32 is: 1,034.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.32 : 1,178.52 = 690.32 : x
  2. Step 2: Convert to fraction form
    786.32/1,178.52 = 690.32/x
  3. Step 3: Cross multiply
    786.32x = 1,178.52 × 690.32
  4. Step 4: Simplify right side
    786.32x = 813,555.93
  5. Step 5: Solve for x
    x = 813,555.93/786.32
  6. Step 6: Final answer
    x = 1,034.64

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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.