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Finding the Fourth Proportional to 1,140.72, 1,574.23 and 643.36

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Solution

The fourth proportional to 1,140.72, 1,574.23 and 643.36 is: 887.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.72 : 1,574.23 = 643.36 : x
  2. Step 2: Convert to fraction form
    1,140.72/1,574.23 = 643.36/x
  3. Step 3: Cross multiply
    1,140.72x = 1,574.23 × 643.36
  4. Step 4: Simplify right side
    1,140.72x = 1,012,796.61
  5. Step 5: Solve for x
    x = 1,012,796.61/1,140.72
  6. Step 6: Final answer
    x = 887.86

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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.