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Finding the Fourth Proportional to 1,661.12, 2,491.68 and 783.34

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Solution

The fourth proportional to 1,661.12, 2,491.68 and 783.34 is: 1,175.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,661.12 : 2,491.68 = 783.34 : x
  2. Step 2: Convert to fraction form
    1,661.12/2,491.68 = 783.34/x
  3. Step 3: Cross multiply
    1,661.12x = 2,491.68 × 783.34
  4. Step 4: Simplify right side
    1,661.12x = 1,951,829.32
  5. Step 5: Solve for x
    x = 1,951,829.32/1,661.12
  6. Step 6: Final answer
    x = 1,175.01

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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.