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Finding the Fourth Proportional to 1,378.22, 1,900.67 and 929.88

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Solution

The fourth proportional to 1,378.22, 1,900.67 and 929.88 is: 1,282.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.22 : 1,900.67 = 929.88 : x
  2. Step 2: Convert to fraction form
    1,378.22/1,900.67 = 929.88/x
  3. Step 3: Cross multiply
    1,378.22x = 1,900.67 × 929.88
  4. Step 4: Simplify right side
    1,378.22x = 1,767,390.37
  5. Step 5: Solve for x
    x = 1,767,390.37/1,378.22
  6. Step 6: Final answer
    x = 1,282.38

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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.