Home / 12,782.28-17,639.64-7,116.88

Finding the Fourth Proportional to 12,782.28, 17,639.64 and 7,116.88

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Solution

The fourth proportional to 12,782.28, 17,639.64 and 7,116.88 is: 9,821.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,782.28 : 17,639.64 = 7,116.88 : x
  2. Step 2: Convert to fraction form
    12,782.28/17,639.64 = 7,116.88/x
  3. Step 3: Cross multiply
    12,782.28x = 17,639.64 × 7,116.88
  4. Step 4: Simplify right side
    12,782.28x = 125,539,201.12
  5. Step 5: Solve for x
    x = 125,539,201.12/12,782.28
  6. Step 6: Final answer
    x = 9,821.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.