Home / 1,732.20-2,390.64-986.40

Finding the Fourth Proportional to 1,732.20, 2,390.64 and 986.40

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Solution

The fourth proportional to 1,732.20, 2,390.64 and 986.40 is: 1,361.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,732.20 : 2,390.64 = 986.40 : x
  2. Step 2: Convert to fraction form
    1,732.20/2,390.64 = 986.40/x
  3. Step 3: Cross multiply
    1,732.20x = 2,390.64 × 986.40
  4. Step 4: Simplify right side
    1,732.20x = 2,358,127.30
  5. Step 5: Solve for x
    x = 2,358,127.30/1,732.20
  6. Step 6: Final answer
    x = 1,361.35

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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.