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Finding the Fourth Proportional to 1,344.98, 2,017.88 and 420.64

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Solution

The fourth proportional to 1,344.98, 2,017.88 and 420.64 is: 631.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,344.98 : 2,017.88 = 420.64 : x
  2. Step 2: Convert to fraction form
    1,344.98/2,017.88 = 420.64/x
  3. Step 3: Cross multiply
    1,344.98x = 2,017.88 × 420.64
  4. Step 4: Simplify right side
    1,344.98x = 848,793.90
  5. Step 5: Solve for x
    x = 848,793.90/1,344.98
  6. Step 6: Final answer
    x = 631.08

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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.