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Finding the Fourth Proportional to 1,265.20, 1,899.60 and 991.60

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Solution

The fourth proportional to 1,265.20, 1,899.60 and 991.60 is: 1,488.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.20 : 1,899.60 = 991.60 : x
  2. Step 2: Convert to fraction form
    1,265.20/1,899.60 = 991.60/x
  3. Step 3: Cross multiply
    1,265.20x = 1,899.60 × 991.60
  4. Step 4: Simplify right side
    1,265.20x = 1,883,643.36
  5. Step 5: Solve for x
    x = 1,883,643.36/1,265.20
  6. Step 6: Final answer
    x = 1,488.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.