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Finding the Fourth Proportional to 2,172.80, 3,258.86 and 612.92

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Solution

The fourth proportional to 2,172.80, 3,258.86 and 612.92 is: 919.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.80 : 3,258.86 = 612.92 : x
  2. Step 2: Convert to fraction form
    2,172.80/3,258.86 = 612.92/x
  3. Step 3: Cross multiply
    2,172.80x = 3,258.86 × 612.92
  4. Step 4: Simplify right side
    2,172.80x = 1,997,420.47
  5. Step 5: Solve for x
    x = 1,997,420.47/2,172.80
  6. Step 6: Final answer
    x = 919.28

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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.