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Finding the Fourth Proportional to 1,767, 2,438.46 and 981.21

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Solution

The fourth proportional to 1,767, 2,438.46 and 981.21 is: 1,354.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,767 : 2,438.46 = 981.21 : x
  2. Step 2: Convert to fraction form
    1,767/2,438.46 = 981.21/x
  3. Step 3: Cross multiply
    1,767x = 2,438.46 × 981.21
  4. Step 4: Simplify right side
    1,767x = 2,392,641.34
  5. Step 5: Solve for x
    x = 2,392,641.34/1,767
  6. Step 6: Final answer
    x = 1,354.07

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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.