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Finding the Fourth Proportional to 1,262.40, 1,890.90 and 1,100.40

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Solution

The fourth proportional to 1,262.40, 1,890.90 and 1,100.40 is: 1,648.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,262.40 : 1,890.90 = 1,100.40 : x
  2. Step 2: Convert to fraction form
    1,262.40/1,890.90 = 1,100.40/x
  3. Step 3: Cross multiply
    1,262.40x = 1,890.90 × 1,100.40
  4. Step 4: Simplify right side
    1,262.40x = 2,080,746.36
  5. Step 5: Solve for x
    x = 2,080,746.36/1,262.40
  6. Step 6: Final answer
    x = 1,648.25

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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.