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Finding the Fourth Proportional to 1,140.53, 1,573.97 and 643.22

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Solution

The fourth proportional to 1,140.53, 1,573.97 and 643.22 is: 887.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.53 : 1,573.97 = 643.22 : x
  2. Step 2: Convert to fraction form
    1,140.53/1,573.97 = 643.22/x
  3. Step 3: Cross multiply
    1,140.53x = 1,573.97 × 643.22
  4. Step 4: Simplify right side
    1,140.53x = 1,012,397.90
  5. Step 5: Solve for x
    x = 1,012,397.90/1,140.53
  6. Step 6: Final answer
    x = 887.66

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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.