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Finding the Fourth Proportional to 1,386.72, 1,912.92 and 888.80

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Solution

The fourth proportional to 1,386.72, 1,912.92 and 888.80 is: 1,226.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.72 : 1,912.92 = 888.80 : x
  2. Step 2: Convert to fraction form
    1,386.72/1,912.92 = 888.80/x
  3. Step 3: Cross multiply
    1,386.72x = 1,912.92 × 888.80
  4. Step 4: Simplify right side
    1,386.72x = 1,700,203.30
  5. Step 5: Solve for x
    x = 1,700,203.30/1,386.72
  6. Step 6: Final answer
    x = 1,226.06

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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.