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Finding the Fourth Proportional to 1,215.91, 1,678.25 and 692.25

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Solution

The fourth proportional to 1,215.91, 1,678.25 and 692.25 is: 955.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.91 : 1,678.25 = 692.25 : x
  2. Step 2: Convert to fraction form
    1,215.91/1,678.25 = 692.25/x
  3. Step 3: Cross multiply
    1,215.91x = 1,678.25 × 692.25
  4. Step 4: Simplify right side
    1,215.91x = 1,161,768.56
  5. Step 5: Solve for x
    x = 1,161,768.56/1,215.91
  6. Step 6: Final answer
    x = 955.47

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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.