Home / 12,689.28-17,511.60-7,100.40

Finding the Fourth Proportional to 12,689.28, 17,511.60 and 7,100.40

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Solution

The fourth proportional to 12,689.28, 17,511.60 and 7,100.40 is: 9,798.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,689.28 : 17,511.60 = 7,100.40 : x
  2. Step 2: Convert to fraction form
    12,689.28/17,511.60 = 7,100.40/x
  3. Step 3: Cross multiply
    12,689.28x = 17,511.60 × 7,100.40
  4. Step 4: Simplify right side
    12,689.28x = 124,339,364.64
  5. Step 5: Solve for x
    x = 124,339,364.64/12,689.28
  6. Step 6: Final answer
    x = 9,798.77

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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.