Home / 1,911.70-2,638.13-1,072.40

Finding the Fourth Proportional to 1,911.70, 2,638.13 and 1,072.40

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Solution

The fourth proportional to 1,911.70, 2,638.13 and 1,072.40 is: 1,479.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.70 : 2,638.13 = 1,072.40 : x
  2. Step 2: Convert to fraction form
    1,911.70/2,638.13 = 1,072.40/x
  3. Step 3: Cross multiply
    1,911.70x = 2,638.13 × 1,072.40
  4. Step 4: Simplify right side
    1,911.70x = 2,829,130.61
  5. Step 5: Solve for x
    x = 2,829,130.61/1,911.70
  6. Step 6: Final answer
    x = 1,479.90

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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.