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Finding the Fourth Proportional to 1,731.76, 2,389.71 and 985.84

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Solution

The fourth proportional to 1,731.76, 2,389.71 and 985.84 is: 1,360.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,731.76 : 2,389.71 = 985.84 : x
  2. Step 2: Convert to fraction form
    1,731.76/2,389.71 = 985.84/x
  3. Step 3: Cross multiply
    1,731.76x = 2,389.71 × 985.84
  4. Step 4: Simplify right side
    1,731.76x = 2,355,871.71
  5. Step 5: Solve for x
    x = 2,355,871.71/1,731.76
  6. Step 6: Final answer
    x = 1,360.39

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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.