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Finding the Fourth Proportional to 901.40, 1,242.68 and 635.45

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Solution

The fourth proportional to 901.40, 1,242.68 and 635.45 is: 876.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.40 : 1,242.68 = 635.45 : x
  2. Step 2: Convert to fraction form
    901.40/1,242.68 = 635.45/x
  3. Step 3: Cross multiply
    901.40x = 1,242.68 × 635.45
  4. Step 4: Simplify right side
    901.40x = 789,651.62
  5. Step 5: Solve for x
    x = 789,651.62/901.40
  6. Step 6: Final answer
    x = 876.03

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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.