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Finding the Fourth Proportional to 1,326.84, 1,990.47 and 437.09

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Solution

The fourth proportional to 1,326.84, 1,990.47 and 437.09 is: 655.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.84 : 1,990.47 = 437.09 : x
  2. Step 2: Convert to fraction form
    1,326.84/1,990.47 = 437.09/x
  3. Step 3: Cross multiply
    1,326.84x = 1,990.47 × 437.09
  4. Step 4: Simplify right side
    1,326.84x = 870,012.04
  5. Step 5: Solve for x
    x = 870,012.04/1,326.84
  6. Step 6: Final answer
    x = 655.70

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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.