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Finding the Fourth Proportional to 1,376.18, 1,899.24 and 786.76

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Solution

The fourth proportional to 1,376.18, 1,899.24 and 786.76 is: 1,085.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,376.18 : 1,899.24 = 786.76 : x
  2. Step 2: Convert to fraction form
    1,376.18/1,899.24 = 786.76/x
  3. Step 3: Cross multiply
    1,376.18x = 1,899.24 × 786.76
  4. Step 4: Simplify right side
    1,376.18x = 1,494,246.06
  5. Step 5: Solve for x
    x = 1,494,246.06/1,376.18
  6. Step 6: Final answer
    x = 1,085.79

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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.