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Finding the Fourth Proportional to 1,572.97, 2,170.11 and 982.48

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Solution

The fourth proportional to 1,572.97, 2,170.11 and 982.48 is: 1,355.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,572.97 : 2,170.11 = 982.48 : x
  2. Step 2: Convert to fraction form
    1,572.97/2,170.11 = 982.48/x
  3. Step 3: Cross multiply
    1,572.97x = 2,170.11 × 982.48
  4. Step 4: Simplify right side
    1,572.97x = 2,132,089.67
  5. Step 5: Solve for x
    x = 2,132,089.67/1,572.97
  6. Step 6: Final answer
    x = 1,355.45

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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.