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Finding the Fourth Proportional to 1,700.80, 2,549.40 and 660.40

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Solution

The fourth proportional to 1,700.80, 2,549.40 and 660.40 is: 989.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,700.80 : 2,549.40 = 660.40 : x
  2. Step 2: Convert to fraction form
    1,700.80/2,549.40 = 660.40/x
  3. Step 3: Cross multiply
    1,700.80x = 2,549.40 × 660.40
  4. Step 4: Simplify right side
    1,700.80x = 1,683,623.76
  5. Step 5: Solve for x
    x = 1,683,623.76/1,700.80
  6. Step 6: Final answer
    x = 989.90

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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.