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Finding the Fourth Proportional to 1,326.91, 1,990.26 and 546.70

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Solution

The fourth proportional to 1,326.91, 1,990.26 and 546.70 is: 820.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.91 : 1,990.26 = 546.70 : x
  2. Step 2: Convert to fraction form
    1,326.91/1,990.26 = 546.70/x
  3. Step 3: Cross multiply
    1,326.91x = 1,990.26 × 546.70
  4. Step 4: Simplify right side
    1,326.91x = 1,088,075.14
  5. Step 5: Solve for x
    x = 1,088,075.14/1,326.91
  6. Step 6: Final answer
    x = 820.01

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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.