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Finding the Fourth Proportional to 912.55, 1,259.39 and 746.30

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Solution

The fourth proportional to 912.55, 1,259.39 and 746.30 is: 1,029.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.55 : 1,259.39 = 746.30 : x
  2. Step 2: Convert to fraction form
    912.55/1,259.39 = 746.30/x
  3. Step 3: Cross multiply
    912.55x = 1,259.39 × 746.30
  4. Step 4: Simplify right side
    912.55x = 939,878.33
  5. Step 5: Solve for x
    x = 939,878.33/912.55
  6. Step 6: Final answer
    x = 1,029.95

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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.