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Finding the Fourth Proportional to 1,328.01, 1,990.35 and 841.20

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Solution

The fourth proportional to 1,328.01, 1,990.35 and 841.20 is: 1,260.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.01 : 1,990.35 = 841.20 : x
  2. Step 2: Convert to fraction form
    1,328.01/1,990.35 = 841.20/x
  3. Step 3: Cross multiply
    1,328.01x = 1,990.35 × 841.20
  4. Step 4: Simplify right side
    1,328.01x = 1,674,282.42
  5. Step 5: Solve for x
    x = 1,674,282.42/1,328.01
  6. Step 6: Final answer
    x = 1,260.75

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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.