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Finding the Fourth Proportional to 1,390.44, 1,918.80 and 800.88

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Solution

The fourth proportional to 1,390.44, 1,918.80 and 800.88 is: 1,105.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.44 : 1,918.80 = 800.88 : x
  2. Step 2: Convert to fraction form
    1,390.44/1,918.80 = 800.88/x
  3. Step 3: Cross multiply
    1,390.44x = 1,918.80 × 800.88
  4. Step 4: Simplify right side
    1,390.44x = 1,536,728.54
  5. Step 5: Solve for x
    x = 1,536,728.54/1,390.44
  6. Step 6: Final answer
    x = 1,105.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.