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Finding the Fourth Proportional to 13,607.70, 18,780.56 and 7,639.77

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Solution

The fourth proportional to 13,607.70, 18,780.56 and 7,639.77 is: 10,543.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,607.70 : 18,780.56 = 7,639.77 : x
  2. Step 2: Convert to fraction form
    13,607.70/18,780.56 = 7,639.77/x
  3. Step 3: Cross multiply
    13,607.70x = 18,780.56 × 7,639.77
  4. Step 4: Simplify right side
    13,607.70x = 143,479,114.11
  5. Step 5: Solve for x
    x = 143,479,114.11/13,607.70
  6. Step 6: Final answer
    x = 10,543.97

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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.