Home / 1,330.88-1,989.75-1,127.72

Finding the Fourth Proportional to 1,330.88, 1,989.75 and 1,127.72

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Solution

The fourth proportional to 1,330.88, 1,989.75 and 1,127.72 is: 1,686.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.88 : 1,989.75 = 1,127.72 : x
  2. Step 2: Convert to fraction form
    1,330.88/1,989.75 = 1,127.72/x
  3. Step 3: Cross multiply
    1,330.88x = 1,989.75 × 1,127.72
  4. Step 4: Simplify right side
    1,330.88x = 2,243,880.87
  5. Step 5: Solve for x
    x = 2,243,880.87/1,330.88
  6. Step 6: Final answer
    x = 1,686.01

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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.