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Finding the Fourth Proportional to 901.58, 1,240.97 and 639.14

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Solution

The fourth proportional to 901.58, 1,240.97 and 639.14 is: 879.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.58 : 1,240.97 = 639.14 : x
  2. Step 2: Convert to fraction form
    901.58/1,240.97 = 639.14/x
  3. Step 3: Cross multiply
    901.58x = 1,240.97 × 639.14
  4. Step 4: Simplify right side
    901.58x = 793,153.57
  5. Step 5: Solve for x
    x = 793,153.57/901.58
  6. Step 6: Final answer
    x = 879.74

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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.