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Finding the Fourth Proportional to 12,965.20, 19,447.80 and 4,200.40

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Solution

The fourth proportional to 12,965.20, 19,447.80 and 4,200.40 is: 6,300.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,965.20 : 19,447.80 = 4,200.40 : x
  2. Step 2: Convert to fraction form
    12,965.20/19,447.80 = 4,200.40/x
  3. Step 3: Cross multiply
    12,965.20x = 19,447.80 × 4,200.40
  4. Step 4: Simplify right side
    12,965.20x = 81,688,539.12
  5. Step 5: Solve for x
    x = 81,688,539.12/12,965.20
  6. Step 6: Final answer
    x = 6,300.60

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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.