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Finding the Fourth Proportional to 1,688.69, 2,330.36 and 980.49

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Solution

The fourth proportional to 1,688.69, 2,330.36 and 980.49 is: 1,353.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,688.69 : 2,330.36 = 980.49 : x
  2. Step 2: Convert to fraction form
    1,688.69/2,330.36 = 980.49/x
  3. Step 3: Cross multiply
    1,688.69x = 2,330.36 × 980.49
  4. Step 4: Simplify right side
    1,688.69x = 2,284,894.68
  5. Step 5: Solve for x
    x = 2,284,894.68/1,688.69
  6. Step 6: Final answer
    x = 1,353.06

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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.