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Finding the Fourth Proportional to 1,428.47, 2,142.71 and 454.57

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Solution

The fourth proportional to 1,428.47, 2,142.71 and 454.57 is: 681.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.47 : 2,142.71 = 454.57 : x
  2. Step 2: Convert to fraction form
    1,428.47/2,142.71 = 454.57/x
  3. Step 3: Cross multiply
    1,428.47x = 2,142.71 × 454.57
  4. Step 4: Simplify right side
    1,428.47x = 974,011.68
  5. Step 5: Solve for x
    x = 974,011.68/1,428.47
  6. Step 6: Final answer
    x = 681.86

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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.