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Finding the Fourth Proportional to 1,380.56, 1,905.14 and 751.07

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Solution

The fourth proportional to 1,380.56, 1,905.14 and 751.07 is: 1,036.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.56 : 1,905.14 = 751.07 : x
  2. Step 2: Convert to fraction form
    1,380.56/1,905.14 = 751.07/x
  3. Step 3: Cross multiply
    1,380.56x = 1,905.14 × 751.07
  4. Step 4: Simplify right side
    1,380.56x = 1,430,903.71
  5. Step 5: Solve for x
    x = 1,430,903.71/1,380.56
  6. Step 6: Final answer
    x = 1,036.46

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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.