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Finding the Fourth Proportional to 1,216.07, 1,678.17 and 692.09

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Solution

The fourth proportional to 1,216.07, 1,678.17 and 692.09 is: 955.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.07 : 1,678.17 = 692.09 : x
  2. Step 2: Convert to fraction form
    1,216.07/1,678.17 = 692.09/x
  3. Step 3: Cross multiply
    1,216.07x = 1,678.17 × 692.09
  4. Step 4: Simplify right side
    1,216.07x = 1,161,444.68
  5. Step 5: Solve for x
    x = 1,161,444.68/1,216.07
  6. Step 6: Final answer
    x = 955.08

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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.