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Finding the Fourth Proportional to 1,292.65, 1,938.57 and 745.09

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Solution

The fourth proportional to 1,292.65, 1,938.57 and 745.09 is: 1,117.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.65 : 1,938.57 = 745.09 : x
  2. Step 2: Convert to fraction form
    1,292.65/1,938.57 = 745.09/x
  3. Step 3: Cross multiply
    1,292.65x = 1,938.57 × 745.09
  4. Step 4: Simplify right side
    1,292.65x = 1,444,409.12
  5. Step 5: Solve for x
    x = 1,444,409.12/1,292.65
  6. Step 6: Final answer
    x = 1,117.40

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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.