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Finding the Fourth Proportional to 1,639.44, 2,459.14 and 981.50

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Solution

The fourth proportional to 1,639.44, 2,459.14 and 981.50 is: 1,472.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.44 : 2,459.14 = 981.50 : x
  2. Step 2: Convert to fraction form
    1,639.44/2,459.14 = 981.50/x
  3. Step 3: Cross multiply
    1,639.44x = 2,459.14 × 981.50
  4. Step 4: Simplify right side
    1,639.44x = 2,413,654.51
  5. Step 5: Solve for x
    x = 2,413,654.51/1,639.44
  6. Step 6: Final answer
    x = 1,472.24

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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.