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Finding the Fourth Proportional to 1,216.60, 1,678.80 and 692.68

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Solution

The fourth proportional to 1,216.60, 1,678.80 and 692.68 is: 955.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.60 : 1,678.80 = 692.68 : x
  2. Step 2: Convert to fraction form
    1,216.60/1,678.80 = 692.68/x
  3. Step 3: Cross multiply
    1,216.60x = 1,678.80 × 692.68
  4. Step 4: Simplify right side
    1,216.60x = 1,162,871.18
  5. Step 5: Solve for x
    x = 1,162,871.18/1,216.60
  6. Step 6: Final answer
    x = 955.84

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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.