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Finding the Fourth Proportional to 1,281.91, 1,769.21 and 888.25

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Solution

The fourth proportional to 1,281.91, 1,769.21 and 888.25 is: 1,225.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.91 : 1,769.21 = 888.25 : x
  2. Step 2: Convert to fraction form
    1,281.91/1,769.21 = 888.25/x
  3. Step 3: Cross multiply
    1,281.91x = 1,769.21 × 888.25
  4. Step 4: Simplify right side
    1,281.91x = 1,571,500.78
  5. Step 5: Solve for x
    x = 1,571,500.78/1,281.91
  6. Step 6: Final answer
    x = 1,225.91

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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.