Home / 1,731.68-2,389.80-985.72

Finding the Fourth Proportional to 1,731.68, 2,389.80 and 985.72

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Solution

The fourth proportional to 1,731.68, 2,389.80 and 985.72 is: 1,360.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,731.68 : 2,389.80 = 985.72 : x
  2. Step 2: Convert to fraction form
    1,731.68/2,389.80 = 985.72/x
  3. Step 3: Cross multiply
    1,731.68x = 2,389.80 × 985.72
  4. Step 4: Simplify right side
    1,731.68x = 2,355,673.66
  5. Step 5: Solve for x
    x = 2,355,673.66/1,731.68
  6. Step 6: Final answer
    x = 1,360.34

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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.