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Finding the Fourth Proportional to 912.21, 1,260.55 and 746.36

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Solution

The fourth proportional to 912.21, 1,260.55 and 746.36 is: 1,031.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.21 : 1,260.55 = 746.36 : x
  2. Step 2: Convert to fraction form
    912.21/1,260.55 = 746.36/x
  3. Step 3: Cross multiply
    912.21x = 1,260.55 × 746.36
  4. Step 4: Simplify right side
    912.21x = 940,824.10
  5. Step 5: Solve for x
    x = 940,824.10/912.21
  6. Step 6: Final answer
    x = 1,031.37

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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.