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Finding the Fourth Proportional to 1,382.20, 1,907.42 and 761.20

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Solution

The fourth proportional to 1,382.20, 1,907.42 and 761.20 is: 1,050.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.20 : 1,907.42 = 761.20 : x
  2. Step 2: Convert to fraction form
    1,382.20/1,907.42 = 761.20/x
  3. Step 3: Cross multiply
    1,382.20x = 1,907.42 × 761.20
  4. Step 4: Simplify right side
    1,382.20x = 1,451,928.10
  5. Step 5: Solve for x
    x = 1,451,928.10/1,382.20
  6. Step 6: Final answer
    x = 1,050.45

Related Problems

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Half scale
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Double scale
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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.