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Finding the Fourth Proportional to 1,641.70, 2,458.90 and 991.08

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Solution

The fourth proportional to 1,641.70, 2,458.90 and 991.08 is: 1,484.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,641.70 : 2,458.90 = 991.08 : x
  2. Step 2: Convert to fraction form
    1,641.70/2,458.90 = 991.08/x
  3. Step 3: Cross multiply
    1,641.70x = 2,458.90 × 991.08
  4. Step 4: Simplify right side
    1,641.70x = 2,436,966.61
  5. Step 5: Solve for x
    x = 2,436,966.61/1,641.70
  6. Step 6: Final answer
    x = 1,484.42

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1.5x scale

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.