Home / 1,420.32-2,131.20-651.36

Finding the Fourth Proportional to 1,420.32, 2,131.20 and 651.36

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Solution

The fourth proportional to 1,420.32, 2,131.20 and 651.36 is: 977.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.32 : 2,131.20 = 651.36 : x
  2. Step 2: Convert to fraction form
    1,420.32/2,131.20 = 651.36/x
  3. Step 3: Cross multiply
    1,420.32x = 2,131.20 × 651.36
  4. Step 4: Simplify right side
    1,420.32x = 1,388,178.43
  5. Step 5: Solve for x
    x = 1,388,178.43/1,420.32
  6. Step 6: Final answer
    x = 977.37

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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.