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Finding the Fourth Proportional to 1,080.35, 1,490.88 and 638.47

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Solution

The fourth proportional to 1,080.35, 1,490.88 and 638.47 is: 881.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.35 : 1,490.88 = 638.47 : x
  2. Step 2: Convert to fraction form
    1,080.35/1,490.88 = 638.47/x
  3. Step 3: Cross multiply
    1,080.35x = 1,490.88 × 638.47
  4. Step 4: Simplify right side
    1,080.35x = 951,878.43
  5. Step 5: Solve for x
    x = 951,878.43/1,080.35
  6. Step 6: Final answer
    x = 881.09

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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.