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Finding the Fourth Proportional to 1,210.59, 1,671.12 and 768.74

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Solution

The fourth proportional to 1,210.59, 1,671.12 and 768.74 is: 1,061.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.59 : 1,671.12 = 768.74 : x
  2. Step 2: Convert to fraction form
    1,210.59/1,671.12 = 768.74/x
  3. Step 3: Cross multiply
    1,210.59x = 1,671.12 × 768.74
  4. Step 4: Simplify right side
    1,210.59x = 1,284,648.43
  5. Step 5: Solve for x
    x = 1,284,648.43/1,210.59
  6. Step 6: Final answer
    x = 1,061.18

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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.