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Finding the Fourth Proportional to 839.94, 1,264.99 and 749.46

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Solution

The fourth proportional to 839.94, 1,264.99 and 749.46 is: 1,128.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.94 : 1,264.99 = 749.46 : x
  2. Step 2: Convert to fraction form
    839.94/1,264.99 = 749.46/x
  3. Step 3: Cross multiply
    839.94x = 1,264.99 × 749.46
  4. Step 4: Simplify right side
    839.94x = 948,059.41
  5. Step 5: Solve for x
    x = 948,059.41/839.94
  6. Step 6: Final answer
    x = 1,128.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.