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Finding the Fourth Proportional to 1,815.70, 2,726.10 and 938.80

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Solution

The fourth proportional to 1,815.70, 2,726.10 and 938.80 is: 1,409.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,815.70 : 2,726.10 = 938.80 : x
  2. Step 2: Convert to fraction form
    1,815.70/2,726.10 = 938.80/x
  3. Step 3: Cross multiply
    1,815.70x = 2,726.10 × 938.80
  4. Step 4: Simplify right side
    1,815.70x = 2,559,262.68
  5. Step 5: Solve for x
    x = 2,559,262.68/1,815.70
  6. Step 6: Final answer
    x = 1,409.52

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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.