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Finding the Fourth Proportional to 12,689.63, 17,511.69 and 7,100.63

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Solution

The fourth proportional to 12,689.63, 17,511.69 and 7,100.63 is: 9,798.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,689.63 : 17,511.69 = 7,100.63 : x
  2. Step 2: Convert to fraction form
    12,689.63/17,511.69 = 7,100.63/x
  3. Step 3: Cross multiply
    12,689.63x = 17,511.69 × 7,100.63
  4. Step 4: Simplify right side
    12,689.63x = 124,343,943.81
  5. Step 5: Solve for x
    x = 124,343,943.81/12,689.63
  6. Step 6: Final answer
    x = 9,798.87

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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.