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Finding the Fourth Proportional to 1,292, 1,780.32 and 1,247.04

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Solution

The fourth proportional to 1,292, 1,780.32 and 1,247.04 is: 1,718.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292 : 1,780.32 = 1,247.04 : x
  2. Step 2: Convert to fraction form
    1,292/1,780.32 = 1,247.04/x
  3. Step 3: Cross multiply
    1,292x = 1,780.32 × 1,247.04
  4. Step 4: Simplify right side
    1,292x = 2,220,130.25
  5. Step 5: Solve for x
    x = 2,220,130.25/1,292
  6. Step 6: Final answer
    x = 1,718.37

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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.