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Finding the Fourth Proportional to 13,607.66, 18,776.21 and 7,639.58

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Solution

The fourth proportional to 13,607.66, 18,776.21 and 7,639.58 is: 10,541.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,607.66 : 18,776.21 = 7,639.58 : x
  2. Step 2: Convert to fraction form
    13,607.66/18,776.21 = 7,639.58/x
  3. Step 3: Cross multiply
    13,607.66x = 18,776.21 × 7,639.58
  4. Step 4: Simplify right side
    13,607.66x = 143,442,367.13
  5. Step 5: Solve for x
    x = 143,442,367.13/13,607.66
  6. Step 6: Final answer
    x = 10,541.29

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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.