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Finding the Fourth Proportional to 1,216.32, 1,678.62 and 692.40

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Solution

The fourth proportional to 1,216.32, 1,678.62 and 692.40 is: 955.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.32 : 1,678.62 = 692.40 : x
  2. Step 2: Convert to fraction form
    1,216.32/1,678.62 = 692.40/x
  3. Step 3: Cross multiply
    1,216.32x = 1,678.62 × 692.40
  4. Step 4: Simplify right side
    1,216.32x = 1,162,276.49
  5. Step 5: Solve for x
    x = 1,162,276.49/1,216.32
  6. Step 6: Final answer
    x = 955.57

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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.