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Finding the Fourth Proportional to 1,143.64, 1,578.21 and 671.45

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Solution

The fourth proportional to 1,143.64, 1,578.21 and 671.45 is: 926.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.64 : 1,578.21 = 671.45 : x
  2. Step 2: Convert to fraction form
    1,143.64/1,578.21 = 671.45/x
  3. Step 3: Cross multiply
    1,143.64x = 1,578.21 × 671.45
  4. Step 4: Simplify right side
    1,143.64x = 1,059,677.86
  5. Step 5: Solve for x
    x = 1,059,677.86/1,143.64
  6. Step 6: Final answer
    x = 926.59

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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.