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Finding the Fourth Proportional to 1,215.79, 1,678.17 and 692.17

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Solution

The fourth proportional to 1,215.79, 1,678.17 and 692.17 is: 955.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.79 : 1,678.17 = 692.17 : x
  2. Step 2: Convert to fraction form
    1,215.79/1,678.17 = 692.17/x
  3. Step 3: Cross multiply
    1,215.79x = 1,678.17 × 692.17
  4. Step 4: Simplify right side
    1,215.79x = 1,161,578.93
  5. Step 5: Solve for x
    x = 1,161,578.93/1,215.79
  6. Step 6: Final answer
    x = 955.41

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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.