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Finding the Fourth Proportional to 2,172.61, 3,258.92 and 785.94

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Solution

The fourth proportional to 2,172.61, 3,258.92 and 785.94 is: 1,178.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.61 : 3,258.92 = 785.94 : x
  2. Step 2: Convert to fraction form
    2,172.61/3,258.92 = 785.94/x
  3. Step 3: Cross multiply
    2,172.61x = 3,258.92 × 785.94
  4. Step 4: Simplify right side
    2,172.61x = 2,561,315.58
  5. Step 5: Solve for x
    x = 2,561,315.58/2,172.61
  6. Step 6: Final answer
    x = 1,178.91

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1.5x scale

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.