Home / 1,438.10-2,154.30-1,128.50

Finding the Fourth Proportional to 1,438.10, 2,154.30 and 1,128.50

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Solution

The fourth proportional to 1,438.10, 2,154.30 and 1,128.50 is: 1,690.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.10 : 2,154.30 = 1,128.50 : x
  2. Step 2: Convert to fraction form
    1,438.10/2,154.30 = 1,128.50/x
  3. Step 3: Cross multiply
    1,438.10x = 2,154.30 × 1,128.50
  4. Step 4: Simplify right side
    1,438.10x = 2,431,127.55
  5. Step 5: Solve for x
    x = 2,431,127.55/1,438.10
  6. Step 6: Final answer
    x = 1,690.51

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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.