Home / 1,431.30-2,145.70-554.40

Finding the Fourth Proportional to 1,431.30, 2,145.70 and 554.40

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Solution

The fourth proportional to 1,431.30, 2,145.70 and 554.40 is: 831.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.30 : 2,145.70 = 554.40 : x
  2. Step 2: Convert to fraction form
    1,431.30/2,145.70 = 554.40/x
  3. Step 3: Cross multiply
    1,431.30x = 2,145.70 × 554.40
  4. Step 4: Simplify right side
    1,431.30x = 1,189,576.08
  5. Step 5: Solve for x
    x = 1,189,576.08/1,431.30
  6. Step 6: Final answer
    x = 831.12

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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.