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Finding the Fourth Proportional to 1,008.46, 1,390.28 and 756.75

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Solution

The fourth proportional to 1,008.46, 1,390.28 and 756.75 is: 1,043.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.46 : 1,390.28 = 756.75 : x
  2. Step 2: Convert to fraction form
    1,008.46/1,390.28 = 756.75/x
  3. Step 3: Cross multiply
    1,008.46x = 1,390.28 × 756.75
  4. Step 4: Simplify right side
    1,008.46x = 1,052,096.28
  5. Step 5: Solve for x
    x = 1,052,096.28/1,008.46
  6. Step 6: Final answer
    x = 1,043.27

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Half 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.