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Finding the Fourth Proportional to 1,388.60, 1,916.25 and 759.19

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Solution

The fourth proportional to 1,388.60, 1,916.25 and 759.19 is: 1,047.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.60 : 1,916.25 = 759.19 : x
  2. Step 2: Convert to fraction form
    1,388.60/1,916.25 = 759.19/x
  3. Step 3: Cross multiply
    1,388.60x = 1,916.25 × 759.19
  4. Step 4: Simplify right side
    1,388.60x = 1,454,797.84
  5. Step 5: Solve for x
    x = 1,454,797.84/1,388.60
  6. Step 6: Final answer
    x = 1,047.67

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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.