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Finding the Fourth Proportional to 12,901.60, 19,372.20 and 7,069.60

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Solution

The fourth proportional to 12,901.60, 19,372.20 and 7,069.60 is: 10,615.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,901.60 : 19,372.20 = 7,069.60 : x
  2. Step 2: Convert to fraction form
    12,901.60/19,372.20 = 7,069.60/x
  3. Step 3: Cross multiply
    12,901.60x = 19,372.20 × 7,069.60
  4. Step 4: Simplify right side
    12,901.60x = 136,953,705.12
  5. Step 5: Solve for x
    x = 136,953,705.12/12,901.60
  6. Step 6: Final answer
    x = 10,615.25

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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.