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Finding the Fourth Proportional to 1,216.55, 1,678.52 and 692.57

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Solution

The fourth proportional to 1,216.55, 1,678.52 and 692.57 is: 955.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.55 : 1,678.52 = 692.57 : x
  2. Step 2: Convert to fraction form
    1,216.55/1,678.52 = 692.57/x
  3. Step 3: Cross multiply
    1,216.55x = 1,678.52 × 692.57
  4. Step 4: Simplify right side
    1,216.55x = 1,162,489.13
  5. Step 5: Solve for x
    x = 1,162,489.13/1,216.55
  6. Step 6: Final answer
    x = 955.56

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1.5x scale

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.