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Finding the Fourth Proportional to 901.80, 1,242.81 and 680.40

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Solution

The fourth proportional to 901.80, 1,242.81 and 680.40 is: 937.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.80 : 1,242.81 = 680.40 : x
  2. Step 2: Convert to fraction form
    901.80/1,242.81 = 680.40/x
  3. Step 3: Cross multiply
    901.80x = 1,242.81 × 680.40
  4. Step 4: Simplify right side
    901.80x = 845,607.92
  5. Step 5: Solve for x
    x = 845,607.92/901.80
  6. Step 6: Final answer
    x = 937.69

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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.