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Finding the Fourth Proportional to 1,120.65, 1,546.14 and 678.39

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Solution

The fourth proportional to 1,120.65, 1,546.14 and 678.39 is: 935.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.65 : 1,546.14 = 678.39 : x
  2. Step 2: Convert to fraction form
    1,120.65/1,546.14 = 678.39/x
  3. Step 3: Cross multiply
    1,120.65x = 1,546.14 × 678.39
  4. Step 4: Simplify right side
    1,120.65x = 1,048,885.91
  5. Step 5: Solve for x
    x = 1,048,885.91/1,120.65
  6. Step 6: Final answer
    x = 935.96

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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.