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Finding the Fourth Proportional to 912.00, 1,257.40 and 699.56

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Solution

The fourth proportional to 912.00, 1,257.40 and 699.56 is: 964.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.00 : 1,257.40 = 699.56 : x
  2. Step 2: Convert to fraction form
    912.00/1,257.40 = 699.56/x
  3. Step 3: Cross multiply
    912.00x = 1,257.40 × 699.56
  4. Step 4: Simplify right side
    912.00x = 879,626.05
  5. Step 5: Solve for x
    x = 879,626.05/912.00
  6. Step 6: Final answer
    x = 964.50

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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.