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Finding the Fourth Proportional to 1,780.76, 2,671.74 and 685.16

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Solution

The fourth proportional to 1,780.76, 2,671.74 and 685.16 is: 1,027.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,780.76 : 2,671.74 = 685.16 : x
  2. Step 2: Convert to fraction form
    1,780.76/2,671.74 = 685.16/x
  3. Step 3: Cross multiply
    1,780.76x = 2,671.74 × 685.16
  4. Step 4: Simplify right side
    1,780.76x = 1,830,569.38
  5. Step 5: Solve for x
    x = 1,830,569.38/1,780.76
  6. Step 6: Final answer
    x = 1,027.97

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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.