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Finding the Fourth Proportional to 1,202.19, 1,658.83 and 678.21

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Solution

The fourth proportional to 1,202.19, 1,658.83 and 678.21 is: 935.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,202.19 : 1,658.83 = 678.21 : x
  2. Step 2: Convert to fraction form
    1,202.19/1,658.83 = 678.21/x
  3. Step 3: Cross multiply
    1,202.19x = 1,658.83 × 678.21
  4. Step 4: Simplify right side
    1,202.19x = 1,125,035.09
  5. Step 5: Solve for x
    x = 1,125,035.09/1,202.19
  6. Step 6: Final answer
    x = 935.82

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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.