Home / 1,420.14-2,128.80-804.36

Finding the Fourth Proportional to 1,420.14, 2,128.80 and 804.36

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Solution

The fourth proportional to 1,420.14, 2,128.80 and 804.36 is: 1,205.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.14 : 2,128.80 = 804.36 : x
  2. Step 2: Convert to fraction form
    1,420.14/2,128.80 = 804.36/x
  3. Step 3: Cross multiply
    1,420.14x = 2,128.80 × 804.36
  4. Step 4: Simplify right side
    1,420.14x = 1,712,321.57
  5. Step 5: Solve for x
    x = 1,712,321.57/1,420.14
  6. Step 6: Final answer
    x = 1,205.74

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1.5x scale

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.