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Finding the Fourth Proportional to 1,216.34, 1,678.62 and 692.37

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Solution

The fourth proportional to 1,216.34, 1,678.62 and 692.37 is: 955.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.34 : 1,678.62 = 692.37 : x
  2. Step 2: Convert to fraction form
    1,216.34/1,678.62 = 692.37/x
  3. Step 3: Cross multiply
    1,216.34x = 1,678.62 × 692.37
  4. Step 4: Simplify right side
    1,216.34x = 1,162,226.13
  5. Step 5: Solve for x
    x = 1,162,226.13/1,216.34
  6. Step 6: Final answer
    x = 955.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.