Home / 1,121.28-1,681.36-471.36

Finding the Fourth Proportional to 1,121.28, 1,681.36 and 471.36

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Solution

The fourth proportional to 1,121.28, 1,681.36 and 471.36 is: 706.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.28 : 1,681.36 = 471.36 : x
  2. Step 2: Convert to fraction form
    1,121.28/1,681.36 = 471.36/x
  3. Step 3: Cross multiply
    1,121.28x = 1,681.36 × 471.36
  4. Step 4: Simplify right side
    1,121.28x = 792,525.85
  5. Step 5: Solve for x
    x = 792,525.85/1,121.28
  6. Step 6: Final answer
    x = 706.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.