Home / 1,571.85-2,166.80-981.36

Finding the Fourth Proportional to 1,571.85, 2,166.80 and 981.36

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Solution

The fourth proportional to 1,571.85, 2,166.80 and 981.36 is: 1,352.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,571.85 : 2,166.80 = 981.36 : x
  2. Step 2: Convert to fraction form
    1,571.85/2,166.80 = 981.36/x
  3. Step 3: Cross multiply
    1,571.85x = 2,166.80 × 981.36
  4. Step 4: Simplify right side
    1,571.85x = 2,126,405.94
  5. Step 5: Solve for x
    x = 2,126,405.94/1,571.85
  6. Step 6: Final answer
    x = 1,352.80

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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.