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Finding the Fourth Proportional to 1,688.90, 2,330.31 and 980.34

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Solution

The fourth proportional to 1,688.90, 2,330.31 and 980.34 is: 1,352.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,688.90 : 2,330.31 = 980.34 : x
  2. Step 2: Convert to fraction form
    1,688.90/2,330.31 = 980.34/x
  3. Step 3: Cross multiply
    1,688.90x = 2,330.31 × 980.34
  4. Step 4: Simplify right side
    1,688.90x = 2,284,493.98
  5. Step 5: Solve for x
    x = 2,284,493.98/1,688.90
  6. Step 6: Final answer
    x = 1,352.65

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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.