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Finding the Fourth Proportional to 1,731.62, 2,389.56 and 985.74

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Solution

The fourth proportional to 1,731.62, 2,389.56 and 985.74 is: 1,360.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,731.62 : 2,389.56 = 985.74 : x
  2. Step 2: Convert to fraction form
    1,731.62/2,389.56 = 985.74/x
  3. Step 3: Cross multiply
    1,731.62x = 2,389.56 × 985.74
  4. Step 4: Simplify right side
    1,731.62x = 2,355,484.87
  5. Step 5: Solve for x
    x = 2,355,484.87/1,731.62
  6. Step 6: Final answer
    x = 1,360.28

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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.