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Finding the Fourth Proportional to 1,572.40, 2,355.40 and 1,262.57

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Solution

The fourth proportional to 1,572.40, 2,355.40 and 1,262.57 is: 1,891.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,572.40 : 2,355.40 = 1,262.57 : x
  2. Step 2: Convert to fraction form
    1,572.40/2,355.40 = 1,262.57/x
  3. Step 3: Cross multiply
    1,572.40x = 2,355.40 × 1,262.57
  4. Step 4: Simplify right side
    1,572.40x = 2,973,857.38
  5. Step 5: Solve for x
    x = 2,973,857.38/1,572.40
  6. Step 6: Final answer
    x = 1,891.29

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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.