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Finding the Fourth Proportional to 1,686.22, 2,529.30 and 660.22

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Solution

The fourth proportional to 1,686.22, 2,529.30 and 660.22 is: 990.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686.22 : 2,529.30 = 660.22 : x
  2. Step 2: Convert to fraction form
    1,686.22/2,529.30 = 660.22/x
  3. Step 3: Cross multiply
    1,686.22x = 2,529.30 × 660.22
  4. Step 4: Simplify right side
    1,686.22x = 1,669,894.45
  5. Step 5: Solve for x
    x = 1,669,894.45/1,686.22
  6. Step 6: Final answer
    x = 990.32

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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.