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Finding the Fourth Proportional to 1,728.70, 2,385.93 and 1,623.20

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Solution

The fourth proportional to 1,728.70, 2,385.93 and 1,623.20 is: 2,240.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,728.70 : 2,385.93 = 1,623.20 : x
  2. Step 2: Convert to fraction form
    1,728.70/2,385.93 = 1,623.20/x
  3. Step 3: Cross multiply
    1,728.70x = 2,385.93 × 1,623.20
  4. Step 4: Simplify right side
    1,728.70x = 3,872,835.73
  5. Step 5: Solve for x
    x = 3,872,835.73/1,728.70
  6. Step 6: Final answer
    x = 2,240.32

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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.