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Finding the Fourth Proportional to 1,920.18, 2,878.92 and 945.66

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Solution

The fourth proportional to 1,920.18, 2,878.92 and 945.66 is: 1,417.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.18 : 2,878.92 = 945.66 : x
  2. Step 2: Convert to fraction form
    1,920.18/2,878.92 = 945.66/x
  3. Step 3: Cross multiply
    1,920.18x = 2,878.92 × 945.66
  4. Step 4: Simplify right side
    1,920.18x = 2,722,479.49
  5. Step 5: Solve for x
    x = 2,722,479.49/1,920.18
  6. Step 6: Final answer
    x = 1,417.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.