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Finding the Fourth Proportional to 1,328.79, 1,990.10 and 1,282.65

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Solution

The fourth proportional to 1,328.79, 1,990.10 and 1,282.65 is: 1,920.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.79 : 1,990.10 = 1,282.65 : x
  2. Step 2: Convert to fraction form
    1,328.79/1,990.10 = 1,282.65/x
  3. Step 3: Cross multiply
    1,328.79x = 1,990.10 × 1,282.65
  4. Step 4: Simplify right side
    1,328.79x = 2,552,595.35
  5. Step 5: Solve for x
    x = 2,552,595.35/1,328.79
  6. Step 6: Final answer
    x = 1,920.99

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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.