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Finding the Fourth Proportional to 1,387.40, 1,912.40 and 1,014.42

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Solution

The fourth proportional to 1,387.40, 1,912.40 and 1,014.42 is: 1,398.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.40 : 1,912.40 = 1,014.42 : x
  2. Step 2: Convert to fraction form
    1,387.40/1,912.40 = 1,014.42/x
  3. Step 3: Cross multiply
    1,387.40x = 1,912.40 × 1,014.42
  4. Step 4: Simplify right side
    1,387.40x = 1,939,976.81
  5. Step 5: Solve for x
    x = 1,939,976.81/1,387.40
  6. Step 6: Final answer
    x = 1,398.28

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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.