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Finding the Fourth Proportional to 18,958.40, 28,437.60 and 6,646.40

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Solution

The fourth proportional to 18,958.40, 28,437.60 and 6,646.40 is: 9,969.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,958.40 : 28,437.60 = 6,646.40 : x
  2. Step 2: Convert to fraction form
    18,958.40/28,437.60 = 6,646.40/x
  3. Step 3: Cross multiply
    18,958.40x = 28,437.60 × 6,646.40
  4. Step 4: Simplify right side
    18,958.40x = 189,007,664.64
  5. Step 5: Solve for x
    x = 189,007,664.64/18,958.40
  6. Step 6: Final answer
    x = 9,969.60

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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.