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Finding the Fourth Proportional to 1,242.79, 1,715.18 and 745.55

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Solution

The fourth proportional to 1,242.79, 1,715.18 and 745.55 is: 1,028.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.79 : 1,715.18 = 745.55 : x
  2. Step 2: Convert to fraction form
    1,242.79/1,715.18 = 745.55/x
  3. Step 3: Cross multiply
    1,242.79x = 1,715.18 × 745.55
  4. Step 4: Simplify right side
    1,242.79x = 1,278,752.87
  5. Step 5: Solve for x
    x = 1,278,752.87/1,242.79
  6. Step 6: Final answer
    x = 1,028.94

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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.