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Finding the Fourth Proportional to 13,913.50, 20,870.25 and 4,679.50

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Solution

The fourth proportional to 13,913.50, 20,870.25 and 4,679.50 is: 7,019.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,913.50 : 20,870.25 = 4,679.50 : x
  2. Step 2: Convert to fraction form
    13,913.50/20,870.25 = 4,679.50/x
  3. Step 3: Cross multiply
    13,913.50x = 20,870.25 × 4,679.50
  4. Step 4: Simplify right side
    13,913.50x = 97,662,334.88
  5. Step 5: Solve for x
    x = 97,662,334.88/13,913.50
  6. Step 6: Final answer
    x = 7,019.25

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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.