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Finding the Fourth Proportional to 1,780.20, 2,668.92 and 959.16

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Solution

The fourth proportional to 1,780.20, 2,668.92 and 959.16 is: 1,438.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,780.20 : 2,668.92 = 959.16 : x
  2. Step 2: Convert to fraction form
    1,780.20/2,668.92 = 959.16/x
  3. Step 3: Cross multiply
    1,780.20x = 2,668.92 × 959.16
  4. Step 4: Simplify right side
    1,780.20x = 2,559,921.31
  5. Step 5: Solve for x
    x = 2,559,921.31/1,780.20
  6. Step 6: Final answer
    x = 1,438.00

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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.