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Finding the Fourth Proportional to 1,286.94, 1,931.20 and 740.18

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Solution

The fourth proportional to 1,286.94, 1,931.20 and 740.18 is: 1,110.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.94 : 1,931.20 = 740.18 : x
  2. Step 2: Convert to fraction form
    1,286.94/1,931.20 = 740.18/x
  3. Step 3: Cross multiply
    1,286.94x = 1,931.20 × 740.18
  4. Step 4: Simplify right side
    1,286.94x = 1,429,435.62
  5. Step 5: Solve for x
    x = 1,429,435.62/1,286.94
  6. Step 6: Final answer
    x = 1,110.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.