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Finding the Fourth Proportional to 1,578.94, 2,178.91 and 870.74

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Solution

The fourth proportional to 1,578.94, 2,178.91 and 870.74 is: 1,201.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,578.94 : 2,178.91 = 870.74 : x
  2. Step 2: Convert to fraction form
    1,578.94/2,178.91 = 870.74/x
  3. Step 3: Cross multiply
    1,578.94x = 2,178.91 × 870.74
  4. Step 4: Simplify right side
    1,578.94x = 1,897,264.09
  5. Step 5: Solve for x
    x = 1,897,264.09/1,578.94
  6. Step 6: Final answer
    x = 1,201.61

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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.