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Finding the Fourth Proportional to 1,688.88, 2,330.96 and 980.80

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Solution

The fourth proportional to 1,688.88, 2,330.96 and 980.80 is: 1,353.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,688.88 : 2,330.96 = 980.80 : x
  2. Step 2: Convert to fraction form
    1,688.88/2,330.96 = 980.80/x
  3. Step 3: Cross multiply
    1,688.88x = 2,330.96 × 980.80
  4. Step 4: Simplify right side
    1,688.88x = 2,286,205.57
  5. Step 5: Solve for x
    x = 2,286,205.57/1,688.88
  6. Step 6: Final answer
    x = 1,353.68

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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.