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Finding the Fourth Proportional to 12,969.68, 19,420.92 and 9,445.20

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Solution

The fourth proportional to 12,969.68, 19,420.92 and 9,445.20 is: 14,143.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,969.68 : 19,420.92 = 9,445.20 : x
  2. Step 2: Convert to fraction form
    12,969.68/19,420.92 = 9,445.20/x
  3. Step 3: Cross multiply
    12,969.68x = 19,420.92 × 9,445.20
  4. Step 4: Simplify right side
    12,969.68x = 183,434,473.58
  5. Step 5: Solve for x
    x = 183,434,473.58/12,969.68
  6. Step 6: Final answer
    x = 14,143.33

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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.