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Finding the Fourth Proportional to 12,459.69, 18,697.64 and 6,620.40

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Solution

The fourth proportional to 12,459.69, 18,697.64 and 6,620.40 is: 9,934.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,459.69 : 18,697.64 = 6,620.40 : x
  2. Step 2: Convert to fraction form
    12,459.69/18,697.64 = 6,620.40/x
  3. Step 3: Cross multiply
    12,459.69x = 18,697.64 × 6,620.40
  4. Step 4: Simplify right side
    12,459.69x = 123,785,822.75
  5. Step 5: Solve for x
    x = 123,785,822.75/12,459.69
  6. Step 6: Final answer
    x = 9,934.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.