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Finding the Fourth Proportional to 1,712.56, 2,568.80 and 981.60

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Solution

The fourth proportional to 1,712.56, 2,568.80 and 981.60 is: 1,472.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,712.56 : 2,568.80 = 981.60 : x
  2. Step 2: Convert to fraction form
    1,712.56/2,568.80 = 981.60/x
  3. Step 3: Cross multiply
    1,712.56x = 2,568.80 × 981.60
  4. Step 4: Simplify right side
    1,712.56x = 2,521,534.08
  5. Step 5: Solve for x
    x = 2,521,534.08/1,712.56
  6. Step 6: Final answer
    x = 1,472.38

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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.