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Finding the Fourth Proportional to 13,630.71, 18,805.05 and 7,661.01

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Solution

The fourth proportional to 13,630.71, 18,805.05 and 7,661.01 is: 10,569.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,630.71 : 18,805.05 = 7,661.01 : x
  2. Step 2: Convert to fraction form
    13,630.71/18,805.05 = 7,661.01/x
  3. Step 3: Cross multiply
    13,630.71x = 18,805.05 × 7,661.01
  4. Step 4: Simplify right side
    13,630.71x = 144,065,676.10
  5. Step 5: Solve for x
    x = 144,065,676.10/13,630.71
  6. Step 6: Final answer
    x = 10,569.20

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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.