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Finding the Fourth Proportional to 1,265.53, 1,899.48 and 779.53

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Solution

The fourth proportional to 1,265.53, 1,899.48 and 779.53 is: 1,170.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.53 : 1,899.48 = 779.53 : x
  2. Step 2: Convert to fraction form
    1,265.53/1,899.48 = 779.53/x
  3. Step 3: Cross multiply
    1,265.53x = 1,899.48 × 779.53
  4. Step 4: Simplify right side
    1,265.53x = 1,480,701.64
  5. Step 5: Solve for x
    x = 1,480,701.64/1,265.53
  6. Step 6: Final answer
    x = 1,170.02

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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.