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Finding the Fourth Proportional to 1,385.59, 1,912.07 and 756.13

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Solution

The fourth proportional to 1,385.59, 1,912.07 and 756.13 is: 1,043.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.59 : 1,912.07 = 756.13 : x
  2. Step 2: Convert to fraction form
    1,385.59/1,912.07 = 756.13/x
  3. Step 3: Cross multiply
    1,385.59x = 1,912.07 × 756.13
  4. Step 4: Simplify right side
    1,385.59x = 1,445,773.49
  5. Step 5: Solve for x
    x = 1,445,773.49/1,385.59
  6. Step 6: Final answer
    x = 1,043.44

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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.