Home / 1,571.15-2,168.17-981.57

Finding the Fourth Proportional to 1,571.15, 2,168.17 and 981.57

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Solution

The fourth proportional to 1,571.15, 2,168.17 and 981.57 is: 1,354.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,571.15 : 2,168.17 = 981.57 : x
  2. Step 2: Convert to fraction form
    1,571.15/2,168.17 = 981.57/x
  3. Step 3: Cross multiply
    1,571.15x = 2,168.17 × 981.57
  4. Step 4: Simplify right side
    1,571.15x = 2,128,204.11
  5. Step 5: Solve for x
    x = 2,128,204.11/1,571.15
  6. Step 6: Final answer
    x = 1,354.55

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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.