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Finding the Fourth Proportional to 1,140.71, 1,574.57 and 721.76

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Solution

The fourth proportional to 1,140.71, 1,574.57 and 721.76 is: 996.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.71 : 1,574.57 = 721.76 : x
  2. Step 2: Convert to fraction form
    1,140.71/1,574.57 = 721.76/x
  3. Step 3: Cross multiply
    1,140.71x = 1,574.57 × 721.76
  4. Step 4: Simplify right side
    1,140.71x = 1,136,450.16
  5. Step 5: Solve for x
    x = 1,136,450.16/1,140.71
  6. Step 6: Final answer
    x = 996.27

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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.