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Finding the Fourth Proportional to 1,325.21, 1,987.47 and 447.57

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Solution

The fourth proportional to 1,325.21, 1,987.47 and 447.57 is: 671.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.21 : 1,987.47 = 447.57 : x
  2. Step 2: Convert to fraction form
    1,325.21/1,987.47 = 447.57/x
  3. Step 3: Cross multiply
    1,325.21x = 1,987.47 × 447.57
  4. Step 4: Simplify right side
    1,325.21x = 889,531.95
  5. Step 5: Solve for x
    x = 889,531.95/1,325.21
  6. Step 6: Final answer
    x = 671.24

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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.