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Finding the Fourth Proportional to 12,689.71, 17,515.32 and 7,385.55

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Solution

The fourth proportional to 12,689.71, 17,515.32 and 7,385.55 is: 10,194.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,689.71 : 17,515.32 = 7,385.55 : x
  2. Step 2: Convert to fraction form
    12,689.71/17,515.32 = 7,385.55/x
  3. Step 3: Cross multiply
    12,689.71x = 17,515.32 × 7,385.55
  4. Step 4: Simplify right side
    12,689.71x = 129,360,271.63
  5. Step 5: Solve for x
    x = 129,360,271.63/12,689.71
  6. Step 6: Final answer
    x = 10,194.11

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Double scale
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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.