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Finding the Fourth Proportional to 1,731.93, 2,389.61 and 985.79

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Solution

The fourth proportional to 1,731.93, 2,389.61 and 985.79 is: 1,360.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,731.93 : 2,389.61 = 985.79 : x
  2. Step 2: Convert to fraction form
    1,731.93/2,389.61 = 985.79/x
  3. Step 3: Cross multiply
    1,731.93x = 2,389.61 × 985.79
  4. Step 4: Simplify right side
    1,731.93x = 2,355,636.76
  5. Step 5: Solve for x
    x = 2,355,636.76/1,731.93
  6. Step 6: Final answer
    x = 1,360.12

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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.