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Finding the Fourth Proportional to 1,731.18, 2,389.18 and 985.38

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Solution

The fourth proportional to 1,731.18, 2,389.18 and 985.38 is: 1,359.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,731.18 : 2,389.18 = 985.38 : x
  2. Step 2: Convert to fraction form
    1,731.18/2,389.18 = 985.38/x
  3. Step 3: Cross multiply
    1,731.18x = 2,389.18 × 985.38
  4. Step 4: Simplify right side
    1,731.18x = 2,354,250.19
  5. Step 5: Solve for x
    x = 2,354,250.19/1,731.18
  6. Step 6: Final answer
    x = 1,359.91

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1.5x scale

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.