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Finding the Fourth Proportional to 1,385.87, 1,912.53 and 756.40

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Solution

The fourth proportional to 1,385.87, 1,912.53 and 756.40 is: 1,043.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.87 : 1,912.53 = 756.40 : x
  2. Step 2: Convert to fraction form
    1,385.87/1,912.53 = 756.40/x
  3. Step 3: Cross multiply
    1,385.87x = 1,912.53 × 756.40
  4. Step 4: Simplify right side
    1,385.87x = 1,446,637.69
  5. Step 5: Solve for x
    x = 1,446,637.69/1,385.87
  6. Step 6: Final answer
    x = 1,043.85

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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.