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Finding the Fourth Proportional to 1,013.88, 1,404.87 and 991.20

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Solution

The fourth proportional to 1,013.88, 1,404.87 and 991.20 is: 1,373.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.88 : 1,404.87 = 991.20 : x
  2. Step 2: Convert to fraction form
    1,013.88/1,404.87 = 991.20/x
  3. Step 3: Cross multiply
    1,013.88x = 1,404.87 × 991.20
  4. Step 4: Simplify right side
    1,013.88x = 1,392,507.14
  5. Step 5: Solve for x
    x = 1,392,507.14/1,013.88
  6. Step 6: Final answer
    x = 1,373.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.