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Finding the Fourth Proportional to 1,421.94, 1,961.38 and 979.08

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Solution

The fourth proportional to 1,421.94, 1,961.38 and 979.08 is: 1,350.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.94 : 1,961.38 = 979.08 : x
  2. Step 2: Convert to fraction form
    1,421.94/1,961.38 = 979.08/x
  3. Step 3: Cross multiply
    1,421.94x = 1,961.38 × 979.08
  4. Step 4: Simplify right side
    1,421.94x = 1,920,347.93
  5. Step 5: Solve for x
    x = 1,920,347.93/1,421.94
  6. Step 6: Final answer
    x = 1,350.51

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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.