Home / 1,438.16-2,152.36-861.44

Finding the Fourth Proportional to 1,438.16, 2,152.36 and 861.44

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Solution

The fourth proportional to 1,438.16, 2,152.36 and 861.44 is: 1,289.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.16 : 2,152.36 = 861.44 : x
  2. Step 2: Convert to fraction form
    1,438.16/2,152.36 = 861.44/x
  3. Step 3: Cross multiply
    1,438.16x = 2,152.36 × 861.44
  4. Step 4: Simplify right side
    1,438.16x = 1,854,129.00
  5. Step 5: Solve for x
    x = 1,854,129.00/1,438.16
  6. Step 6: Final answer
    x = 1,289.24

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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.