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Finding the Fourth Proportional to 1,378.31, 1,900.65 and 959.14

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Solution

The fourth proportional to 1,378.31, 1,900.65 and 959.14 is: 1,322.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.31 : 1,900.65 = 959.14 : x
  2. Step 2: Convert to fraction form
    1,378.31/1,900.65 = 959.14/x
  3. Step 3: Cross multiply
    1,378.31x = 1,900.65 × 959.14
  4. Step 4: Simplify right side
    1,378.31x = 1,822,975.14
  5. Step 5: Solve for x
    x = 1,822,975.14/1,378.31
  6. Step 6: Final answer
    x = 1,322.62

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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.