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Finding the Fourth Proportional to 1,438.50, 2,157.86 and 561.28

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Solution

The fourth proportional to 1,438.50, 2,157.86 and 561.28 is: 841.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.50 : 2,157.86 = 561.28 : x
  2. Step 2: Convert to fraction form
    1,438.50/2,157.86 = 561.28/x
  3. Step 3: Cross multiply
    1,438.50x = 2,157.86 × 561.28
  4. Step 4: Simplify right side
    1,438.50x = 1,211,163.66
  5. Step 5: Solve for x
    x = 1,211,163.66/1,438.50
  6. Step 6: Final answer
    x = 841.96

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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.