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Finding the Fourth Proportional to 901.64, 1,241.52 and 639.20

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Solution

The fourth proportional to 901.64, 1,241.52 and 639.20 is: 880.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.64 : 1,241.52 = 639.20 : x
  2. Step 2: Convert to fraction form
    901.64/1,241.52 = 639.20/x
  3. Step 3: Cross multiply
    901.64x = 1,241.52 × 639.20
  4. Step 4: Simplify right side
    901.64x = 793,579.58
  5. Step 5: Solve for x
    x = 793,579.58/901.64
  6. Step 6: Final answer
    x = 880.15

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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.