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Finding the Fourth Proportional to 1,438.93, 2,157.08 and 698.39

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Solution

The fourth proportional to 1,438.93, 2,157.08 and 698.39 is: 1,046.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.93 : 2,157.08 = 698.39 : x
  2. Step 2: Convert to fraction form
    1,438.93/2,157.08 = 698.39/x
  3. Step 3: Cross multiply
    1,438.93x = 2,157.08 × 698.39
  4. Step 4: Simplify right side
    1,438.93x = 1,506,480.84
  5. Step 5: Solve for x
    x = 1,506,480.84/1,438.93
  6. Step 6: Final answer
    x = 1,046.94

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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.