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Finding the Fourth Proportional to 3,605.40, 5,408.10 and 972.90

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Solution

The fourth proportional to 3,605.40, 5,408.10 and 972.90 is: 1,459.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,605.40 : 5,408.10 = 972.90 : x
  2. Step 2: Convert to fraction form
    3,605.40/5,408.10 = 972.90/x
  3. Step 3: Cross multiply
    3,605.40x = 5,408.10 × 972.90
  4. Step 4: Simplify right side
    3,605.40x = 5,261,540.49
  5. Step 5: Solve for x
    x = 5,261,540.49/3,605.40
  6. Step 6: Final answer
    x = 1,459.35

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1.5x scale

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.