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Finding the Fourth Proportional to 2,179.80, 3,009.20 and 1,706.87

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Solution

The fourth proportional to 2,179.80, 3,009.20 and 1,706.87 is: 2,356.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,179.80 : 3,009.20 = 1,706.87 : x
  2. Step 2: Convert to fraction form
    2,179.80/3,009.20 = 1,706.87/x
  3. Step 3: Cross multiply
    2,179.80x = 3,009.20 × 1,706.87
  4. Step 4: Simplify right side
    2,179.80x = 5,136,312.19
  5. Step 5: Solve for x
    x = 5,136,312.19/2,179.80
  6. Step 6: Final answer
    x = 2,356.32

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1.5x scale

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.